There are 1013 twelve-letter words containing A, 2I and 2T, https://www.bestwordlist.com/c/a/5/12letterwordswithaiitt.htm
ABIRRITATING ABOLITIONIST ABORTIONISTS ABSINTHIATED ABSOLUTISTIC
ABSORPTIVITY ABSTRICTIONS ABSTRUSITIES ACETONITRILE ACTABILITIES
ACTINOMETRIC ADAPTABILITY ADAPTIVITIES ADDITIVITIES ADMINISTRANT
ADMINISTRATE ADOPTABILITY ADOPTIANISTS ADOPTIONISTS ADSCITITIOUS
ADVENTITIOUS AESTHETICIAN AESTHETICISE AESTHETICISM AESTHETICIST
AESTHETICIZE AESTIVATIONS AETIOLOGISTS AGENTIVITIES AGRITOURISTS
AHISTORICITY AIGUILLETTES AIRTIGHTNESS AIRWORTHIEST ALIMENTATION
ALIMENTATIVE ALLITERATING ALLITERATION ALLITERATIVE ALTALTISSIMO
ALTERABILITY ALTIMETRICAL ALTITUDINOUS AMITOTICALLY AMORTISATION
AMORTIZATION ANABAPTISTIC ANASTIGMATIC ANELASTICITY ANNUNTIATING
ANORTHOSITIC ANTAGONISTIC ANTARTHRITIC ANTEPOSITION ANTHELMINTIC
ANTIABORTION ANTIADITISES ANTIAIRCRAFT ANTICATHOLIC ANTICIPATING
ANTICIPATION ANTICIPATIVE ANTICIPATORS ANTICIPATORY ANTICLOTTING
ANTICREATIVE ANTIDIABETIC ANTIDILUTION ANTIDIURETIC ANTIDOGMATIC
ANTIELITISMS ANTIELITISTS ANTIENTROPIC ANTIFASCISTS ANTIFEMINIST
ANTIFRICTION ANTIGENICITY ANTIHALATION ANTIHUMANIST ANTIHYSTERIC
ANTILITERARY ANTILITERATE ANTIMAGNETIC ANTIMILITARY ANTIMITOTICS
ANTIMONIATES ANTIMOSQUITO ANTINATIONAL ANTINEPOTISM ANTINEUTRINO
ANTINOVELIST ANTIOXIDANTS ANTIPARTICLE ANTIPATHETIC ANTIPATHISTS
ANTIPHRASTIC ANTIPOLITICS ANTIPRIESTLY ANTIPRURITIC ANTIPYRETICS
ANTIQUATIONS ANTIRACHITIC ANTIRATIONAL ANTIREALISTS ANTIROMANTIC
ANTIROYALIST ANTISPASTICS ANTISTATISTS ANTISTROPHIC ANTITHEISTIC
ANTITHETICAL ANTITHROMBIN ANTITUSSIVES ANTIVITAMINS APICULTURIST
APOSTATISING APOSTATIZING APOSTOLICITY AQUATINTISTS ARBITRATIONS
ARCHITECTING ARCTOPHILIST ARISTOCRATIC ARITHMETICAL ARTICULATING
ARTICULATION ARTICULATIVE ARTILLERISTS ARTISTICALLY ASTIGMATISMS
ASTRICTIVELY ATHLETICISMS ATOMISATIONS ATOMIZATIONS ATTITUDINISE
ATTITUDINIZE ATTRIBUTIONS ATTRIBUTIVES AUDIOMETRIST AUDIOTYPISTS
AUDITABILITY AUTHENTICITY AUTISTICALLY AUTOCRITIQUE AUTODIDACTIC
AUTOIMMUNITY AUTOMATICITY AUTOMATISING AUTOMATIZING AUTOMOBILIST
AUTOMOBILITY AUTOTOMISING AUTOTOMIZING AUTOXIDATION AVICULTURIST
AVITAMINOTIC BABINGTONITE BABYSITTINGS BACKFITTINGS BAPTISTERIES
BESTIALITIES BIMETALLISTS BIOCATALYTIC BIOSATELLITE BIOTURBATION
BIPARTITIONS BITONALITIES BITUMINATING BRATTISHINGS BRISTLETAILS
CANTILLATING CANTILLATION CAPACITATING CAPACITATION CAPITALISTIC
CAPITULATING CAPITULATION CAPTIVATIONS CARICATURIST CARRIWITCHET
CARTOPHILIST CASSITERITES CASTIGATIONS CATADIOPTRIC CAUSATIONIST
CAUSTICITIES CENTRALISTIC CENTRALITIES CENTURIATION CERTIFICATED
CERTIFICATES CHIASTOLITES CHITCHATTING CHREMATISTIC CHROMATICITY
CITIFICATION CITYFICATION CLARINETISTS CLARINETTIST COACTIVITIES
COALITIONIST COCCIDIOSTAT COGITATINGLY COGITATIVELY COHABITATION
COMPATRIOTIC CONDITIONATE CONSTIPATING CONSTIPATION CONTAGIONIST
CONTIGNATION CONTINUALITY CONTINUATION CONTINUATIVE CORTICATIONS
COUNTABILITY CREATIONISTS CREATIVITIES CREMATIONIST CREPITATIONS
CRISTOBALITE CRITICASTERS CRYSTALLITIC CRYSTALLITIS CULTIVATIONS
CUTABILITIES CUTINISATION CUTINIZATION DEACTIVATING DEACTIVATION
DEBILITATING DEBILITATION DEBILITATIVE DECAPITATING DECAPITATION
DEFLATIONIST DELEGITIMATE DELIMITATING DELIMITATION DELIMITATIVE
DEMOTIVATING DEMOTIVATION DENITRATIONS DEPOSITATION DEPUTISATION
DEPUTIZATION DERMATITIDES DERMATITISES DESTIGMATIZE DESTINATIONS
DETONABILITY DETOXICATING DETOXICATION DEVIATIONIST DEXTRALITIES
DICTATORSHIP DIETETICALLY DIGITISATION DIGITIZATION DILATABILITY
DILATATIONAL DILATOMETRIC DILETTANTISH DILETTANTISM DIPLOMATISTS
DISCEPTATION DISINFECTANT DISINFESTANT DISINTEGRATE DISINTRICATE
DISMUTATIONS DISORIENTATE DISPUTATIONS DISPUTATIOUS DISSERTATING
DISSERTATION DISSERTATIVE DISTILLATION DISTILLATORY DISTORTIONAL
DISTRACTIBLE DISTRACTIONS DISTRAINMENT DISTRIBUTARY DISTURBATIVE
DITHEISTICAL DITHELETICAL DITHYRAMBIST DITRANSITIVE DITTOGRAPHIC
DOCTRINALITY DONATISTICAL DUBITATIVELY EARSPLITTING EDITORIALIST
EDUCATIONIST EGURGITATING ELASTICATING ELASTICATION ELASTICITIES
ELECTABILITY ELICITATIONS ELUTRIATIONS EMOTIONALIST EMOTIONALITY
ENTERTAINING ENTHUSIASTIC EQUATABILITY EQUITABILITY ERGATIVITIES
EROTISATIONS EROTIZATIONS ESSENTIALIST ESSENTIALITY ESTERISATION
ESTERIZATION ESTHETICIANS ETERNALITIES ETERNISATION ETERNIZATION
ETHERISATION ETHERIZATION ETHICALITIES EXCITABILITY EXCOGITATING
EXCOGITATION EXCOGITATIVE EXERCITATION EXFILTRATING EXFILTRATION
EXHAUSTIVITY EXISTENTIALS EXORBITATING EXPATIATIONS EXPATRIATING
EXPATRIATION EXPATRIATISM EXPEDITATING EXPEDITATION EXPLOITATION
EXPLOITATIVE EXTIRPATIONS EXTRADITIONS EXTRALIMITAL EXTRANEITIES
EXTRICATIONS FACILITATING FACILITATION FACILITATIVE FACILITATORS
FACILITATORY FACTIONALIST FACTITIOUSLY FACTUALISTIC FACTUALITIES
FANTASTICISM FATIGABILITY FELICITATING FELICITATION FELICITATORS
FERTIGATIONS FESTINATIONS FICTIONALITY FILTRABILITY FISSICOSTATE
FLAGITATIONS FLOATABILITY FORTEPIANIST FRACTALITIES FRATERNITIES
FRONTALITIES FUSTIGATIONS FUTILITARIAN GELATINATING GELATINATION
GONIATITOIDS GRATILLITIES GRAVITATIONS GUESTIMATING GURGITATIONS
HABILITATING HABILITATION HABILITATORS HABITABILITY HABITATIONAL
HABITUATIONS HAIRCUTTINGS HAIRSPLITTER HAIRSTYLISTS HAMARTHRITIS
HATCHABILITY HEPATISATION HEPATIZATION HERETICATING HERITABILITY
HESITATINGLY HIPPIATRISTS HOSPITALISTS IATROCHEMIST IGNITABILITY
ILLEGITIMATE ILLIMITATION ILLITERATELY ILLUSTRATING ILLUSTRATION
ILLUSTRATIVE IMMANENTISTS IMMATURITIES IMMUTABILITY IMPARTATIONS
IMPARTIALITY IMPASTATIONS IMPETRATIONS IMPLANTATION IMPORTATIONS
IMPUTABILITY IMPUTATIVELY INACTIVATING INACTIVATION INACTIVITIES
INADAPTATION INARTICULATE INATTENTIONS INCANTATIONS INCAPACITANT
INCAPACITATE INCATENATING INCATENATION INCOGITATIVE INCRUSTATION
INDENTATIONS INDOCTRINATE INELASTICITY INEXACTITUDE INFATUATIONS
INFESTATIONS INFILTRATING INFILTRATION INFILTRATIVE INFILTRATORS
INFINITATING INFLATIONIST INFOTAINMENT INGRAFTATION INGRATIATING
INGRATIATION INGRATIATORY INGRATITUDES INGURGITATED INGURGITATES
INHABITATION INITIATIVELY INITIATORIES INITIATRICES INITIATRIXES
INSANITATION INSTALLATION INSTANTIATED INSTANTIATES INSTAURATION
INSTIGATIONS INSTILLATION INTEGRATIONS INTENERATING INTENERATION
INTENSATIVES INTERACTIONS INTERDIALECT INTERDIGITAL INTERFOLIATE
INTERLINEATE INTERMATTING INTERMEDIATE INTERORBITAL INTERPARTIES
INTERSPATIAL INTERSTADIAL INTERSTATION INTERSTITIAL INTERSTRAINS
INTERTIDALLY INTERTILLAGE INTERTRAFFIC INTERVARSITY INTESTINALLY
INTIMATENESS INTIMIDATING INTIMIDATION INTIMIDATORS INTIMIDATORY
INTOLERATION INTONATIONAL INTOXICATING INTOXICATION INTOXICATIVE
INTOXICATORS INTRANSIGENT INTRANSITIVE INTRAUTERINE INTRAVITALLY
INTREATINGLY INTRIGUANTES INTRINSICATE INTURBIDATED INTURBIDATES
INUSITATIONS INVESTIGATED INVESTIGATES INVESTIGATOR INVITATIONAL
INVITATORIES INVULTUATION IRRITABILITY IRRITATINGLY IRROTATIONAL
ISOLATIONIST ITACOLUMITES ITALIANATING ITEMISATIONS ITEMIZATIONS
ITINERATIONS JACTITATIONS JUSTIFICATOR KICKSTARTING KINAESTHETIC
LATERALITIES LATERISATION LATERIZATION LATINISATION LATINIZATION
LATITUDINOUS LECTISTERNIA LEGITIMATELY LEGITIMATING LEGITIMATION
LEGITIMATISE LEGITIMATIZE LEGITIMATORS LEVITATIONAL LICENTIATION
LIMITATIONAL LITERALISTIC LITERALITIES LITHOLATRIES LITHOTOMICAL
MACHTPOLITIK MAGISTRALITY MAILSHOTTING MALNUTRITION MARTINETISMS
MASTICATIONS MATERIALISTS MEDITATIVELY MERCANTILIST MERISTEMATIC
MERITOCRATIC METAFICTIONS METALISATION METALIZATION METAPOLITICS
METASILICATE METEORITICAL METRICATIONS MICROHABITAT MIDLATITUDES
MIDLITTORALS MIGRATIONIST MILITANTNESS MILITARISTIC MINIATURISTS
MINICASSETTE MINISTRATION MINISTRATIVE MISALLOTTING MISATTRIBUTE
MISCITATIONS MISESTIMATED MISESTIMATES MISQUOTATION MITHRIDATISE
MITHRIDATISM MITHRIDATIZE MONETISATION MONETIZATION MOTIVATIONAL
MOTORISATION MOTORIZATION MOUNTAINIEST MULTICIPITAL MULTIFOLIATE
MULTINATIONS MULTIPARTIES MULTIPARTITE MULTIPLICATE MULTISERIATE
MULTITASKING MULTIVARIATE MULTIVITAMIN MUSSITATIONS MUTABILITIES
MUTAGENICITY MUTATIONISTS NATIONALISTS NATRIURETICS NATURALISTIC
NEGATIONISTS NEGATIVISTIC NEGATIVITIES NEGOTIATIONS NEOVITALISTS
NEUTRALISTIC NEUTRALITIES NICTITATIONS NIGHTMARIEST NITROGELATIN
NITROSATIONS NOBILITATING NOBILITATION NONIMITATIVE NONINITIATES
NONIRRITANTS NONMILITANTS NOTABILITIES NOTAPHILISTS NOTARISATION
NOTARIZATION NOTIFICATION NOTIONALISTS NUMISMATISTS NUPTIALITIES
NUTRITIONARY NYCTINASTIES OBLITERATING OBLITERATION OBLITERATIVE
OBSTETRICIAN OBSTIPATIONS OPERATIONIST OPHTHALMITIS OPTIMALITIES
OPTIMISATION OPTIMISTICAL OPTIMIZATION ORIENTALISTS ORIENTATIONS
OUTSTRAINING OVARIOTOMIST OVERACTIVITY PAEDIATRISTS PALATABILITY
PALPITATIONS PANARTHRITIS PANCREATITIS PANTOMIMISTS PARTIALITIES
PARTICIPANTS PARTICIPATED PARTICIPATES PARTICIPATOR PARTITIONERS
PARTITIONING PARTITIONIST PARTURITIONS PATRIALITIES PATRISTICISM
PECTINATIONS PECTISATIONS PECTIZATIONS PENITENTIALS PENITENTIARY
PEPTISATIONS PEPTIZATIONS PERICLITATED PERICLITATES PERIPATETICS
PERISTALITHS PERISTOMATIC PESTILENTIAL PETRIFACTION PETRIFACTIVE
PHILATELISTS PHOTOACTINIC PHYSIATRISTS PICTORIALIST PIGMENTATION
PLASTICITIES PLASTICKIEST PLASTINATION PLATITUDINAL PNEUMATICITY
POLITICASTER PONTIFICATED PONTIFICATES PONTIFICATOR PORTRAITISTS
POSTILLATING POSTILLATION POTABILITIES POTENTIALITY POTENTIARIES
POTENTIATING POTENTIATION PRACTICALIST PRACTICALITY PRACTITIONER
PRAGMATICIST PRAGMATISTIC PREADMITTING PRECIPITANTS PRECIPITATED
PRECIPITATES PRECIPITATOR PRESTIGIATOR PRINTABILITY PROPITIATING
PROPITIATION PROPITIATIVE PROPITIATORS PROPITIATORY PROTACTINIUM
PSYCHIATRIST PUTANGITANGI QUANTISATION QUANTITATING QUANTITATION
QUANTITATIVE QUANTITIVELY QUANTIZATION QUATERNITIES QUIDDITATIVE
RADIESTHETIC RATABILITIES RATIFICATION RATIOCINATED RATIOCINATES
RATIOCINATOR RATIONALISTS REACTIONISTS REACTIVATING REACTIVATION
REACTIVITIES REESTIMATING REESTIMATION REFRACTIVITY REFUTABILITY
REGISTRATION REHABILITANT REHABILITATE REINITIATING REINITIATION
REINSTATIONS REITERATIONS REITERATIVES RELATABILITY RELATIONISTS
RELATIVISTIC RELATIVITIES RELATIVITIST REMOTIVATING REMOTIVATION
REPARTITIONS REPATRIATING REPATRIATION REPETITIONAL REPRISTINATE
REPUTABILITY RESTATIONING RETALIATIONS RETICULATING RETICULATION
RETRACTILITY REVISITATION ROBOTISATION ROBOTIZATION ROMANTICISTS
RUSTICATINGS RUSTICATIONS SALTATIONISM SALTATIONIST SALVATIONIST
SANITISATION SANITIZATION SATELLITISED SATELLITISES SATELLITIUMS
SATELLITIZED SATELLITIZES SATIRISATION SATIRIZATION SATISFACTION
SATURABILITY SCINTILLATED SCINTILLATES SCINTILLATOR SCRUTABILITY
SECTIONALIST SEMANTICISTS SEMILITERATE SENSATIONIST SEPARATISTIC
SESQUITERTIA SHIRTTAILING SHIRTWAISTED SHIRTWAISTER SIDEROSTATIC
SIMULTANEITY SIMVASTATINS SINFONIETTAS SINISTRALITY SITUATIONISM
SLACKTIVISTS SOLICITATION SOLSTITIALLY SOMATIZATION SOPHISTICATE
SPAGHETTINIS SPASTICITIES SPATIALITIES SPIRITUALIST SPIRITUALITY
SPORTABILITY STABILISATOR STABILIZATOR STAINABILITY STATIONARIES
STATIONARILY STATIONERIES STATISTICIAN STICHOMYTHIA STICKABILITY
STIGMATISERS STIGMATISING STIGMATIZERS STIGMATIZING STILLATORIES
STIMULATIONS STIMULATIVES STIPENDIATED STIPENDIATES STIPULATIONS
STOMATITIDES STOMATITISES STRATEGISING STRATEGIZING STREPITATION
STRIDULATING STRIDULATION STROBILATING STROBILATION STRONTIANITE
STYLISATIONS STYLIZATIONS SUSCITATIONS SYNDIOTACTIC SYNTACTICIAN
TACTUALITIES TAMABILITIES TAMBOURINIST TANTALISINGS TANTALIZINGS
TAPSIETEERIE TARGETITISES TAXABILITIES TAXIDERMISTS TEACHABILITY
TECHNICALITY TEMPERALITIE TEMPTABILITY TENABILITIES TERMINATIONS
TERMITARIUMS TERRITORIALS TESTIFICATES TESTIFICATOR TESTIMONIALS
TETANISATION TETANIZATION TETRASTICHIC TEXTUALITIES TEXTUALIZING
THEATRICISED THEATRICISES THEATRICISMS THEATRICIZED THEATRICIZES
THEISTICALLY THEORETICIAN THEORISATION THEORIZATION THIGMOTACTIC
TIMESTAMPING TIMETABLINGS TIMOCRATICAL TINCTORIALLY TINTINNABULA
TITANIFEROUS TITILLATIONS TITIPOUNAMUS TITTIVATIONS TITULARITIES
TOLERABILITY TOPICALITIES TOSTICATIONS TOTALISATION TOTALITARIAN
TOTALIZATION TRACEABILITY TRACHEITIDES TRACHEITISES TRACTABILITY
TRACTILITIES TRADITIONARY TRADITIONERS TRADITIONIST TRADUCIANIST
TRAFFICKIEST TRAINABILITY TRAITORSHIPS TRALATICIOUS TRALATITIOUS
TRAMPOLINIST TRANQUILLITY TRANSITIONAL TRANSITIONED TRANSITIVELY
TRANSITIVITY TRANSITORILY TRANSMITTING TRAUMATISING TRAUMATIZING
TREATABILITY TREPHINATION TREPIDATIONS TREPIDATIOUS TRIBULATIONS
TRICHROMATIC TRICUSPIDATE TRIFOLIOLATE TRIFURCATING TRIFURCATION
TRIGRAMMATIC TRINITARIANS TRINOMIALIST TRIPALMITINS TRIPARTITELY
TRIPARTITION TRIPINNATELY TRIPLICATING TRIPLICATION TRIPUDIATING
TRIPUDIATION TRIRADIATELY TRITAGONISTS TRITHIONATES TRITICALNESS
TRITURATIONS TRIUMPHALIST TRIUMVIRATES TRIVIALITIES TRUSTABILITY
TUBULARITIES TUNABILITIES TURBINATIONS TWISTABILITY TYMPANITISES
TYPICALITIES TYPIFICATION ULTRATINIEST UNARTISTLIKE UNCHASTITIES
UNHESITATING UNITISATIONS UNITIZATIONS UNSAINTLIEST UNSTRATIFIED
UNTENABILITY UTILISATIONS UTILITARIANS UTILIZATIONS VACATIONISTS
VARIATIONIST VASOACTIVITY VATICINATING VATICINATION VATICINATORS
VATICINATORY VENDITATIONS VENTILATIONS VERTICILLATE VINAIGRETTES
VIRTUALITIES VISITATIONAL VISITATORIAL VITALISATION VITALIZATION
VITATIVENESS VITICULTURAL VITILITIGATE VITRAILLISTS VITRIFACTION
VITRIFACTURE VITRIOLATING VITRIOLATION VITUPERATING VITUPERATION
VITUPERATIVE VOLATILITIES VOLITATIONAL WAINSCOTTING WAISTCOATING
WILDCATTINGS WITHSTANDING WITWANTONING