There are 926 fifteen-letter words containing A, 3I and S, https://www.bestwordlist.com/c/a/5/15letterwordswithaiiis.htm ABORIGINALITIES ABSORBABILITIES ACCEPTABILITIES ACCESSIBILITIES ACCIDENTALITIES ACCLIMATISATION ACHROMATICITIES ACQUIRABILITIES ACQUISITIVENESS ACTINOBIOLOGIES ADDITIONALITIES ADJUSTABILITIES ADMINISTRATIONS ADMISSIBILITIES ADSORBABILITIES AFFECTABILITIES AFFORDABILITIES ALKALINISATIONS ALKALINIZATIONS ALLERGENICITIES ALTITUDINARIANS ALUMINOSILICATE AMBIDEXTERITIES AMBISEXUALITIES AMMONIFICATIONS AMPHIDIPLOIDIES ANALYSABILITIES ANALYZABILITIES ANNIHILATIONISM ANSWERABILITIES ANTIABORTIONIST ANTIAPHRODISIAC ANTICAPITALISMS ANTICAPITALISTS ANTICHRISTIANLY ANTICLERICALISM ANTICOLONIALISM ANTICOLONIALIST ANTIDERIVATIVES ANTIFILIBUSTERS ANTIHELMINTHICS ANTIHISTAMINICS ANTILIBERALISMS ANTIMATERIALISM ANTIMATERIALIST ANTIMILITARISMS ANTIMILITARISTS ANTINATIONALIST ANTIPERISTALSIS ANTIPERISTALTIC ANTIPHLOGISTICS ANTIQUARIANISMS ANTIRADICALISMS ANTIRATIONALISM ANTIRATIONALIST ANTIROMANTICISM ANTISEPTICISING ANTISEPTICIZING ANTISEXUALITIES ANTISHOPLIFTING ANTISOCIALITIES ANTISYPHILITICS ANTIVIVISECTION APOLITICALITIES APPEALABILITIES APPLICABILITIES APPROPINQUITIES ARACHNOIDITISES ARIBOFLAVINOSIS ARTERIALISATION ARTIFICIALISING ARTIFICIALITIES ASSIGNABILITIES ASSIMILATIONISM ASSIMILATIONIST ASSOCIABILITIES ASSOCIATIONISMS ASSOCIATIONISTS ASSOCIATIVITIES ATTAINABILITIES ATTITUDINARIANS ATTITUDINISINGS ATTITUDINIZINGS AUDIOMETRICIANS AUTODIDACTICISM AUTOIONISATIONS AUTOIONIZATIONS AUTOSTABILITIES AXIOMATISATIONS AXIOMATIZATIONS AZIDOTHYMIDINES BEAUTIFICATIONS BELIEVABILITIES BIBLIOTHECARIES BIBLIOTHERAPIES BIDIALECTALISMS BIOACOUSTICIANS BIOREGIONALISMS BIOREGIONALISTS BIOREMEDIATIONS BIOSTATISTICIAN BIPARTISANSHIPS BIPOLARISATIONS BIPOLARIZATIONS BITUMINISATIONS BITUMINIZATIONS BREATHABILITIES CALCULABILITIES CALORIFICATIONS CANISTERISATION CANISTERIZATION CANNIBALISATION CAPITALISATIONS CAPITALIZATIONS CATHOLICISATION CENSURABILITIES CERTIFICATORIES CHANGEABILITIES CHARGEABILITIES CHLORITISATIONS CHLORITIZATIONS CINCHONISATIONS CINCHONIZATIONS CIRCULARISATION CIVILIANISATION CLANDESTINITIES CLASSIFICATIONS COADMINISTERING COAGULABILITIES COCKNIFICATIONS CODIFIABILITIES COLLOQUIALITIES COLONISATIONIST COLONIZATIONIST COLOURABILITIES COMBINABILITIES COMMERCIALISING COMMERCIALISTIC COMMERCIALITIES COMMISSIONAIRES COMMUTABILITIES COMMUTATIVITIES COMPARABILITIES COMPATIBILITIES COMPUTABILITIES CONFUSABILITIES CONSANGUINITIES CONSCIONABILITY CONSIMILARITIES CONTRACTILITIES COOPERATIVITIES CORINTHIANISING CORRELATIVITIES COSIGNIFICATIVE CREDITABILITIES CRIMINALISATION CRYSTALLINITIES CULTIVABILITIES DAMAGEABILITIES DECEIVABILITIES DECHRISTIANISED DECHRISTIANISES DECHRISTIANIZED DECHRISTIANIZES DECIMALISATIONS DECIMALIZATIONS DECRIMINALISING DEFEASIBILITIES DEFEMINISATIONS DEFEMINIZATIONS DEFIBRILLATIONS DEFORMABILITIES DEGRADABILITIES DEINDUSTRIALISE DEINDUSTRIALIZE DELECTABILITIES DELEGITIMATIONS DEMATERIALISING DEMOBILISATIONS DEMOBILIZATIONS DEMULSIFICATION DEMYSTIFICATION DENATIONALISING DENAZIFICATIONS DENITRIFICATORS DEPENDABILITIES DEPLORABILITIES DERIVATISATIONS DERIVATIZATIONS DESALINISATIONS DESALINIZATIONS DESENSITISATION DESENSITIZATION DESERTIFICATION DESILVERISATION DESILVERIZATION DESPICABILITIES DESPIRITUALISED DESPIRITUALISES DESPIRITUALIZED DESPIRITUALIZES DESTABILISATION DESTABILIZATION DETACHABILITIES DETECTABILITIES DETERRABILITIES DETESTABILITIES DETOXIFICATIONS DETRIBALISATION DEVITALISATIONS DEVITALIZATIONS DEVOTIONALITIES DIAGONALISATION DIAHELIOTROPISM DIALYSABILITIES DIALYZABILITIES DIAPHRAGMATITIS DIAPHRAGMITISES DICHOTOMISATION DICHROMATICISMS DIGITALISATIONS DIGITALIZATIONS DISAFFILIATIONS DISAFFIRMATIONS DISAGREEABILITY DISAMBIGUATIONS DISAPPLICATIONS DISAPPOINTINGLY DISARTICULATING DISARTICULATION DISASSIMILATING DISASSIMILATION DISASSIMILATIVE DISASSOCIATIONS DISATTRIBUTIONS DISCAPACITATING DISCIPLINARIANS DISCIPLINARIUMS DISCONFIRMATION DISCONTINUATION DISCRETIONARILY DISCRIMINATIONS DISEQUILIBRATED DISEQUILIBRATES DISESTABLISHING DISHABILITATING DISHABILITATION DISILLUMINATING DISINCLINATIONS DISINFESTATIONS DISINFLATIONARY DISINFORMATIONS DISINHERITANCES DISINTEGRATIONS DISINTERMEDIATE DISINTHRALLINGS DISINTOXICATING DISINTOXICATION DISINVIGORATING DISNATURALISING DISNATURALIZING DISORGANISATION DISORGANIZATION DISORIENTATIONS DISPOSABILITIES DISPUTABILITIES DISQUISITIONARY DISREPUTABILITY DISSATISFACTION DISSERTATIONIST DISSIMILARITIES DISSYLLABIFYING DISTINGUISHABLE DISTINGUISHABLY DISTRACTIBILITY DIVERSIFICATION DOCTRINARIANISM DOLOMITISATIONS DOLOMITIZATIONS DUPLICABILITIES EBURNIFICATIONS ECCLESIASTICISM EDUCATABILITIES EGALITARIANISMS ELIMINABILITIES EMANCIPATIONIST EMPLOYABILITIES EMULSIFICATIONS ENUMERABILITIES EPIGRAMMATISING EPISCOPALIANISM EPITHELIALISING EPITHELISATIONS EPITHELIZATIONS EQUALITARIANISM ESTERIFICATIONS ETHERIFICATIONS EVAPORABILITIES EXAMINABILITIES EXCLUDABILITIES EXISTENTIALISMS EXISTENTIALISTS EXPANDABILITIES EXPANSIBILITIES EXPENDABILITIES EXPERIENTIALISM EXPERIENTIALIST EXPORTABILITIES EXTENDABILITIES EXTENSIFICATION EXTENSIVISATION EXTENSIVIZATION EXTERIORISATION EXTRALINGUISTIC EXTRUDABILITIES FACTORABILITIES FAMILIARISATION FANATICISATIONS FANATICIZATIONS FETISHISTICALLY FICTIONISATIONS FICTIONIZATIONS FIDEICOMMISSARY FILTERABILITIES FLEXITARIANISMS FORENSICALITIES FORISFAMILIATED FORISFAMILIATES FORMIDABILITIES FRACTIONALISING FRACTIONISATION FRUCTIFICATIONS FUNCTIONALISTIC FUNCTIONALITIES FUTILITARIANISM GELATINISATIONS GELATINIZATIONS GENTRIFICATIONS GERMINABILITIES GOVERNABILITIES GRANULITISATION GRAPHITISATIONS GRAPHITIZATIONS GREISENISATIONS GREISENIZATIONS HEPARINISATIONS HEPARINIZATIONS HEREDITARIANISM HEREDITARIANIST HIBERNICISATION HISTORIOGRAPHIC HOMOSOCIALITIES HONOURABILITIES HORIZONTALITIES HOSPITALISATION HOSPITALIZATION HUMANITARIANISM HUMANITARIANIST HUMIDIFICATIONS HYPERACTIVITIES HYPERLIPIDEMIAS HYPERSALINITIES HYPNOTISABILITY HYPOPITUITARISM IATROGENICITIES IDENTIFICATIONS IDIOMATICALNESS IDIOMATICNESSES IDIOSYNCRATICAL IDIOTICALNESSES ILLEGALISATIONS ILLEGALIZATIONS ILLEGITIMATIONS ILLIMITABLENESS IMAGINARINESSES IMAGINATIVENESS IMITATIVENESSES IMMATERIALISING IMMATERIALITIES IMMEASURABILITY IMMENSURABILITY IMMISERISATIONS IMMISERIZATIONS IMMOBILISATIONS IMMOBILIZATIONS IMMORTALISATION IMMOVEABILITIES IMMUNODIAGNOSIS IMPALPABILITIES IMPARTIBILITIES IMPASSABILITIES IMPASSIBILITIES IMPECCABILITIES IMPERISHABILITY IMPERSONALISING IMPERSONALITIES IMPERSONALIZING IMPLACABILITIES IMPLICATIVENESS IMPORTABILITIES IMPROBABILITIES IMPROVABILITIES IMPROVISATIONAL IMPROVISATORIAL IMPROVISATRICES IMPROVISATRIXES IMPROVVISATRICE INACCESSIBILITY INADMISSIBILITY INAPPRECIATIONS INARTICULATIONS INCAPACITATIONS INCENTIVISATION INCONSIDERATION INCONSOLABILITY INCOORDINATIONS INCULPABILITIES INDEFEASIBILITY INDETERMINACIES INDIGENISATIONS INDIGENIZATIONS INDIGESTABILITY INDISCIPLINABLE INDISCRETIONARY INDISPUTABILITY INDISTRIBUTABLE INDIVIDUALISERS INDIVIDUALISING INDIVIDUALISTIC INDIVIDUALITIES INDIVIDUALIZERS INDOCTRINATIONS INDUSTRIALISING INDUSTRIALIZING INEDUCABILITIES INEFFICACIOUSLY INEVITABILITIES INEXORABILITIES INFALLIBILITIES INFANTILISATION INFEASIBILITIES INFINITESIMALLY INFORMATISATION INHARMONICITIES INHOSPITALITIES INIMITABILITIES INITIALISATIONS INITIALIZATIONS INOCULABILITIES INOPERABILITIES INORGANISATIONS INORGANIZATIONS INQUISITORIALLY INSATIABILITIES INSIGNIFICANCES INSIGNIFICANTLY INSIGNIFICATIVE INSOCIABILITIES INSOLVABILITIES INSPIRATIONALLY INSPIRATIONISMS INSPIRATIONISTS INSTANTANEITIES INSTITUTIONALLY INSUBORDINATION INTANGIBILITIES INTEGRABILITIES INTEGRATIONISTS INTELLIGENTSIAS INTELLIGENTZIAS INTENSIFICATION INTERACTIONISMS INTERACTIONISTS INTERACTIVITIES INTERANIMATIONS INTERDIVISIONAL INTERIORISATION INTERLINEATIONS INTERMEDIATIONS INTERMIGRATIONS INTERNALISATION INTERSTRATIFIED INTERSTRATIFIES INTERVISITATION INTRANSIGENCIES INTRANSIGENTISM INTRANSIGENTIST INTRANSMISSIBLE INTRINSICALNESS INTUITIONALISMS INTUITIONALISTS INVARIABILITIES INVESTIGATIONAL INVIOLABILITIES IRRATIONALISING IRRATIONALISTIC IRRATIONALITIES IRRESISTABILITY IRRESOLVABILITY ISOIMMUNISATION ISOIMMUNIZATION ISOPERIMETRICAL KARSTIFICATIONS KERATINISATIONS KERATINIZATIONS KINESITHERAPIES LABYRINTHITISES LAPIDIFICATIONS LATENSIFICATION LATITUDINARIANS LEGITIMISATIONS LEGITIMIZATIONS LEXICALISATIONS LEXICALIZATIONS LIBERALISATIONS LIBERALIZATIONS LIBERTARIANISMS LICENTIATESHIPS LIQUIDATIONISMS LIQUIDATIONISTS LISTENABILITIES LITERALISATIONS LITERALIZATIONS LYOPHILISATIONS LYOPHILIZATIONS MACHINABILITIES MAJORITARIANISM MALASSIMILATION MALDISTRIBUTION MANAGEABILITIES MARGINALISATION MARKETABILITIES MASCULINISATION MASCULINIZATION MATERIALISATION MATERIALISTICAL MATHEMATICISING MATRIFOCALITIES MATRILOCALITIES MEASURABILITIES MEDICALISATIONS MEDICALIZATIONS MEMORIALISATION MENSURABILITIES MERIDIONALITIES METAFICTIONISTS METALINGUISTICS METAMICTISATION METAPHYSICISING METAPHYSICIZING METASTABILITIES MICROTONALITIES MILITARISATIONS MILITARIZATIONS MILLENARIANISMS MILLIONAIRESSES MINERALISATIONS MINERALIZATIONS MINIATURISATION MINISTERIALISTS MISAPPLICATIONS MISAPPRECIATING MISAPPRECIATION MISAPPRECIATIVE MISARTICULATING MISARTICULATION MISATTRIBUTIONS MISINFORMATIONS MISORIENTATIONS MISREGISTRATION MISSIONISATIONS MISSIONIZATIONS MISTRANSCRIBING MISUTILISATIONS MISUTILIZATIONS MISVOCALISATION MISVOCALIZATION MODIFIABILITIES MULTIDIVISIONAL MULTILINGUALISM MULTIPLICATIONS MULTIPOLARITIES MULTIRACIALISMS MUSICALISATIONS MUSICALIZATIONS MYLONITISATIONS MYLONITIZATIONS NATIONALISATION NEGOTIABILITIES NITROGENISATION NOMINALISATIONS NOMINALIZATIONS NONADDITIVITIES NONCREATIVITIES NONDURABILITIES NONELASTICITIES NONIMPLICATIONS NONINSECTICIDAL NONRELATIVISTIC NONSIGNIFICANTS NONUTILITARIANS NOTHINGARIANISM NOTICEABILITIES OBSERVABILITIES OBTAINABILITIES OCCASIONALITIES OCCIDENTALISING OLIGOMERISATION OMNISEXUALITIES OPSONIFICATIONS OPTIMALISATIONS OPTIMALIZATIONS OVERSTABILITIES OVERUTILISATION OVOVIVIPARITIES PACHYMENINGITIS PARALINGUISTICS PARASITISATIONS PARASITIZATIONS PARTICIPATORIES PARTICULARISING PARTICULARISTIC PARTICULARITIES PATENTABILITIES PATHOGENICITIES PATRIALISATIONS PATRIALIZATIONS PATRIFOCALITIES PEDESTRIANISING PEDESTRIANIZING PENETRABILITIES PENINSULARITIES PERDURABILITIES PERFECTIBILIANS PERIGASTRITISES PERIHEPATITISES PERIPATETICISMS PERIPHERALITIES PERISHABILITIES PERMUTABILITIES PERSONIFICATION PESSIMISTICALLY PHLOGISTICATING PHONEMICISATION PHONETICISATION PHOTOIONISATION PLASTICISATIONS PLASTICIZATIONS PLATITUDINISERS PLATITUDINISING PLATITUDINIZERS POLITICISATIONS POLITICIZATIONS PONDERABILITIES PONTIFICALITIES POSTIRRADIATION PREDICABILITIES PREFERABILITIES PRESENTIALITIES PRESTIDIGITATOR PRETTIFICATIONS PRIMORDIALITIES PRIORITISATIONS PRIORITIZATIONS PROBABILIORISMS PROBABILIORISTS PROFITABILITIES PROMOTABILITIES PRONOMINALISING PROPAGABILITIES PROPYLITISATION PROVERBIALISING PROVINCIALISING PROVINCIALITIES PRUDENTIALITIES PRUSSIANISATION PRUSSIANIZATION PUNISHABILITIES PUSILLANIMITIES QUADRUPLICITIES QUANTIFICATIONS QUESTIONABILITY QUIZZIFICATIONS RADICALISATIONS RADICALIZATIONS RADIOACTIVITIES RADIOBIOLOGISTS RADIOSENSITISED RADIOSENSITISES RADIOSENSITIZED RADIOSENSITIZES RATIONALISATION REACCLIMATISING READMINISTERING REALISABILITIES REALIZABILITIES REASONABILITIES RECALLABILITIES RECEIVABILITIES RECIPROCALITIES RECODIFICATIONS RECOGNISABILITY RECONCILIATIONS RECTIPETALITIES RECYCLABILITIES REDEEMABILITIES REDISTILLATIONS REFORMABILITIES REFUNDABILITIES REGIONALISATION REHABILITATIONS REHOSPITALISING REHOSPITALIZING REINDUSTRIALISE REINDUSTRIALIZE REINVESTIGATING REINVESTIGATION REINVIGORATIONS RELATIVISATIONS RELATIVIZATIONS REMARKABILITIES REMATERIALISING REMEDIABILITIES REMOBILISATIONS REMOBILIZATIONS RENATIONALISING REPAIRABILITIES REPEATABILITIES REPLICABILITIES REPRISTINATIONS REPRIVATISATION REPUBLICANISING REPUDIATIONISTS RESECTABILITIES RESENSITIZATION RESINIFICATIONS RESOCIALISATION RESOCIALIZATION RESOLVABILITIES RESPIRABILITIES RESPIRITUALISED RESPIRITUALISES RESPIRITUALIZED RESPIRITUALIZES RESTABILIZATION RETALIATIONISTS RETROACTIVITIES RETURNABILITIES REVEALABILITIES REVISUALISATION REVISUALIZATION REVITALISATIONS REVITALIZATIONS REVIVIFICATIONS RIGIDIFICATIONS RITUALISTICALLY ROMANTICALITIES ROMANTICISATION SANCTIFICATIONS SANGUIFICATIONS SAPONIFICATIONS SAPROGENICITIES SCHILLERISATION SCHILLERIZATION SCHISTOSOMIASIS SCINTILLATINGLY SEARCHABILITIES SEASONABILITIES SECTIONISATIONS SECTIONIZATIONS SECURITISATIONS SECURITIZATIONS SEMICOLONIALISM SEMICYLINDRICAL SEMILOGARITHMIC SEMIPARASITISMS SEQUENTIALITIES SERICITISATIONS SERICITIZATIONS SIGNIFICATIVELY SILICIFICATIONS SIMPLICIDENTATE SIMPLIFICATIONS SINGULARISATION SINGULARIZATION SINTERABILITIES SKETCHABILITIES SOCIALISTICALLY SOCIOBIOLOGICAL SOCIOHISTORICAL SOLDERABILITIES SOLEMNIFICATION SOLIDIFICATIONS SOLIPSISTICALLY SOLITUDINARIANS SOLUBILISATIONS SOLUBILIZATIONS SOPHISTICATIONS SPATIALISATIONS SPATIALIZATIONS SPECIALISATIONS SPECIALIZATIONS SPEECHIFICATION SPHEROIDISATION SPHEROIDIZATION SPREADABILITIES SQUEEZABILITIES STIGMATISATIONS STIGMATIZATIONS STIGMATOPHILIAS STIGMATOPHILIST STOICHIOLOGICAL STRATIFICATIONS STROBILISATIONS STROBILIZATIONS STULTIFICATIONS SUBCIVILISATION SUBCIVILIZATION SUBINSINUATIONS SUBMINIATURISED SUBMINIATURISES SUBMINIATURIZED SUBMINIATURIZES SUBOPTIMISATION SUBOPTIMIZATION SUBSPECIALISING SUBSPECIALITIES SUBSPECIALIZING SUBSTANTIVISING SUBSTANTIVITIES SUBSTANTIVIZING SUPERACTIVITIES SUPERFICIALISED SUPERFICIALISES SUPERFICIALIZED SUPERFICIALIZES SUPERINDIVIDUAL SURVIVABILITIES SYLLABIFICATION TANGENTIALITIES TEMPERABILITIES TENOVAGINITISES TERMINABILITIES TERRITORIALISED TERRITORIALISES TERRITORIALISMS TERRITORIALISTS TERRITORIALIZES TESTIMONIALISED TESTIMONIALISES TESTIMONIALIZED TESTIMONIALIZES TETRABASICITIES THEATRICALISING THEATRICALITIES TORRENTIALITIES TOTALITARIANISE TOTALITARIANISM TRADITIONALISED TRADITIONALISES TRADITIONALISMS TRADITIONALISTS TRADITIONALIZES TRANQUILISATION TRANQUILISINGLY TRANSISTORISING TRANSISTORIZING TRANSLUCIDITIES TRIANGULARITIES TRICHINISATIONS TRICHINIZATIONS TRIVIALISATIONS TRIVIALIZATIONS TROPICALISATION UBIQUITARIANISM UBIQUITINATIONS ULTRAVIRILITIES UNASSAILABILITY UNCHRISTIANISED UNCHRISTIANISES UNCHRISTIANIZED UNCHRISTIANIZES UNCHRISTIANLIKE UNDERACTIVITIES UNDISAPPOINTING UNDISCIPLINABLE UNFAMILIARITIES UNIFORMITARIANS UNILATERALITIES UNKNOWABILITIES UNORIGINALITIES UNREADABILITIES UNRELIABILITIES UNSALEABILITIES UNSOCIABILITIES UNSPIRITUALISED UNSPIRITUALISES UNSPIRITUALIZED UNSPIRITUALIZES UNSUITABILITIES UNWORKABILITIES UPGRADABILITIES UTILITARIANISED UTILITARIANISES UTILITARIANISMS UTILITARIANIZES VAPOURABILITIES VERIFIABILITIES VERTICILLATIONS VICISSITUDINARY VINDICABILITIES VINDICATIVENESS VIOLINISTICALLY VIRTUALISATIONS VIRTUALIZATIONS VISCOELASTICITY VISCOSIMETRICAL VISIONARINESSES VITILITIGATIONS VITRIOLISATIONS VITRIOLIZATIONS VIVISECTIONALLY VOLATILISATIONS VOLATILIZATIONS VULNERABILITIES ZINCKIFICATIONS