There are 456 fifteen-letter words containing 2A, I, M and S, https://www.bestwordlist.com/c/a/5/15letterwordswithaaims.htm
ABSTRACTIONISMS ACCLIMATISATION ACHROMATICITIES ACHROMATISATION
ADENOCARCINOMAS ADIATHERMANCIES ADMINISTRATIONS ADMIRABLENESSES
ADRENALECTOMIES AERODYNAMICISTS AFFRANCHISEMENT AGGRANDISEMENTS
AGGRANDIZEMENTS AGRIBUSINESSMAN ALEXIPHARMAKONS ALUMINOSILICATE
AMARYLLIDACEOUS AMBASSADORSHIPS AMBISEXUALITIES AMINOPEPTIDASES
AMINOPHENAZONES AMMONIFICATIONS AMYLOBARBITONES ANAGRAMMATISING
ANCYLOSTOMIASES ANCYLOSTOMIASIS ANKYLOSTOMIASES ANKYLOSTOMIASIS
ANNIHILATIONISM ANOMALISTICALLY ANTHROPOPATHISM ANTIALCOHOLISMS
ANTIARRHYTHMICS ANTICAPITALISMS ANTICLERICALISM ANTICOLONIALISM
ANTIHISTAMINICS ANTILIBERALISMS ANTIMATERIALISM ANTIMATERIALIST
ANTIMETABOLITES ANTIMILITARISMS ANTIMILITARISTS ANTIMONARCHISTS
ANTIQUARIANISMS ANTIRADICALISMS ANTIRATIONALISM ANTIROMANTICISM
ANTISENTIMENTAL APOCALYPTICISMS APOPHTHEGMATISE APOPHTHEGMATIST
APOTHEGMATISING ARCHAEOMETRISTS ARCHEOMAGNETISM AROMATHERAPISTS
ASSIMILATIONISM ASSIMILATIONIST ASSOCIATIONISMS ASTRODYNAMICIST
ATMOSPHERICALLY AUDIOMETRICIANS AUTODIDACTICISM AUTOMATISATIONS
AUTOMATIZATIONS AXIOMATISATIONS AXIOMATIZATIONS BACCHANALIANISM
BIDIALECTALISMS BRACHYCEPHALISM BRACHYDACTYLISM BREATHARIANISMS
CARAMELISATIONS CARAMELIZATIONS CARCINOSARCOMAS CASTANOSPERMINE
CASTRAMETATIONS CATACLYSMICALLY CENTENARIANISMS CHAMBERLAINSHIP
CHRESTOMATHICAL CIRCUMAMBAGIOUS CIRCUMAMBULATES CIRCUMNAVIGATES
CIRCUMSTANTIALS CIRCUMSTANTIATE CLIMATOGRAPHIES COCHAIRMANSHIPS
COMMANDANTSHIPS COMMUNALISATION COMPARABILITIES COMPARATIVENESS
COMPASSIONATELY COMPASSIONATING CRIMINALISATION CYANOCOBALAMINS
CYTOPLASMICALLY DACTYLIOMANCIES DAMAGEABILITIES DECIMALISATIONS
DECIMALIZATIONS DECONTAMINATORS DEGLAMORISATION DEHUMANISATIONS
DEHUMANIZATIONS DEMAGNETISATION DEMATERIALISING DEMOCRATISATION
DEMONSTRATIONAL DEMORALISATIONS DEMORALIZATIONS DEMUTUALISATION
DEPARTMENTALISE DEPARTMENTALISM DERMATOGRAPHIAS DERMATOGRAPHIES
DERMATOPLASTIES DEUTERANOMALIES DEXAMPHETAMINES DIAPHRAGMATITIS
DIAPHRAGMITISES DISACCOMMODATED DISACCOMMODATES DISAFFIRMATIONS
DISAMBIGUATIONS DISARRANGEMENTS DISASSIMILATING DISASSIMILATION
DISASSIMILATIVE DISEMBARKATIONS DISEMBARRASSING DOCTRINARIANISM
DRAUGHTSMANSHIP ECHOCARDIOGRAMS EGALITARIANISMS ELEUTHEROMANIAS
EMANCIPATIONIST ENCOMIASTICALLY ENDOPARASITISMS EPIGRAMMATISERS
EPIGRAMMATISING EPIGRAMMATIZERS EPISCOPALIANISM EQUALITARIANISM
ESEMPLASTICALLY EUDAEMONISTICAL EVANGELICALISMS EXAMINABILITIES
FAMILIARISATION FLAGELLOMANIACS FLAVOURDYNAMICS FLEXITARIANISMS
FORISFAMILIATED FORISFAMILIATES FORMALISTICALLY FORMULARISATION
FRAGMENTARINESS FUNDAMENTALISMS FUNDAMENTALISTS FUTILITARIANISM
GALVANOTROPISMS GASTRONOMICALLY GRAMMATICALNESS GRAMMATICASTERS
GRAMMATOLOGISTS HAEMAGGLUTININS HAMAMELIDACEOUS HARMONISTICALLY
HEADMASTERLIEST HEADMASTERSHIPS HEMAGGLUTINATES HEREDITARIANISM
HEXOSAMINIDASES HIEROGRAMMATIST HOMOPLASTICALLY HUMANITARIANISM
HUMANITARIANIST HYPERADRENALISM HYPERCALCAEMIAS HYPERCATABOLISM
HYPERGLYCAEMIAS HYPERNATRAEMIAS HYPERPARASITISM HYPERURICAEMIAS
HYPOMAGNESAEMIA HYPOMAGNESEMIAS IDIOMATICALNESS IMAGINARINESSES
IMAGINATIVENESS IMMATERIALISING IMMATERIALITIES IMMEASURABILITY
IMMORTALISATION IMMUNOASSAYABLE IMMUNOASSAYISTS IMPALPABILITIES
IMPARTIALNESSES IMPASSABILITIES IMPLACABILITIES IMPRACTICALNESS
IMPROVISATIONAL IMPROVISATORIAL INANIMATENESSES INFLAMMABLENESS
INFORMATISATION INTERANIMATIONS INTERPAROXYSMAL INTRAMUSCULARLY
ISMATICALNESSES LAMELLIROSTRATE LEUCOCYTHAEMIAS LIBERTARIANISMS
LIPOGRAMMATISMS LIPOGRAMMATISTS LYMPHANGIOGRAMS MACADAMISATIONS
MACADAMIZATIONS MACHINABILITIES MACRENCEPHALIAS MACRENCEPHALIES
MACROCOSMICALLY MACROMARKETINGS MACROSCOPICALLY MACROSPORANGIUM
MAGISTERIALNESS MAGISTRATESHIPS MAGISTRATICALLY MAGNANIMOUSNESS
MAJORITARIANISM MALADMINISTERED MALADROITNESSES MALAPPROPRIATES
MALASSIMILATION MALPRESENTATION MANAGEABILITIES MANIFESTATIONAL
MANNERISTICALLY MARGARITIFEROUS MARGINALISATION MARKETABILITIES
MARSHMALLOWIEST MARTENSITICALLY MASCULINISATION MASCULINIZATION
MASOCHISTICALLY MASSOTHERAPISTS MATERFAMILIASES MATERIALISATION
MATERIALISTICAL MATHEMATICISING MATHEMATISATION MATRIARCHALISMS
MATRIFOCALITIES MATRILOCALITIES MEASURABILITIES MECHANISTICALLY
MEDICALISATIONS MEDICALIZATIONS MEGALOCEPHALIES MELODRAMATISING
MEMORIALISATION MENTALISTICALLY MEROBLASTICALLY MESATICEPHALIES
MESATICEPHALOUS METACHROMATISMS METAGRABOLISING METALLOGRAPHIES
METALLOGRAPHIST METAMATHEMATICS METAMICTISATION METASTABILITIES
MICROBAROGRAPHS MILITARISATIONS MILITARIZATIONS MILLENARIANISMS
MINERALISATIONS MINERALIZATIONS MINIATURISATION MINICALCULATORS
MISACCEPTATIONS MISAPPLICATIONS MISAPPRECIATING MISAPPRECIATION
MISAPPRECIATIVE MISAPPROPRIATED MISAPPROPRIATES MISARRANGEMENTS
MISARTICULATING MISARTICULATION MISCALCULATIONS MISCEGENATIONAL
MISCELLANARIANS MISCHARACTERISE MISCHARACTERIZE MISTRANSLATIONS
MISVOCALISATION MISVOCALIZATION MONOSACCHARIDES MORPHINOMANIACS
MULTICANDIDATES MULTICHARACTERS MULTILATERALISM MULTILATERALIST
MULTIPARAMETERS MULTIRACIALISMS MUSICALISATIONS MUSICALIZATIONS
MYOCARDIOGRAPHS NECESSARIANISMS NEOARSPHENAMINE NEUROANATOMISTS
NOCTAMBULATIONS NOMINALISATIONS NOMINALIZATIONS NONASTRONOMICAL
NONCHARISMATICS NONINFLAMMABLES NORMOGLYCAEMIAS NOTHINGARIANISM
NUCLEOPLASMATIC OLIGOCYTHAEMIAS OPERATIONALISMS OPTIMALISATIONS
OPTIMALIZATIONS ORGANOMETALLICS OVERDRAMATISING PALAEOMAGNETISM
PALAEOMAGNETIST PALEOMAGNETISMS PALEOMAGNETISTS PANOPHTHALMITIS
PANTOPRAGMATICS PARAGRAMMATISTS PARAJOURNALISMS PARAMETRISATION
PARAMYXOVIRUSES PARANORMALITIES PARASYMPATHETIC PARLIAMENTARISM
PATERFAMILIASES PATRIARCHALISMS PENTADACTYLISMS PHANTASMAGORIAL
PHANTASMAGORIAS PHANTASMAGORIES PHANTASMALITIES PHARMACEUTICALS
PHARMACOGNOSIES PHARMACOGNOSIST PHARMACOGNOSTIC PHARMACOLOGISTS
PHARMACOPOEIANS PHARMACOPOEISTS PHARMACOPOLISTS PLAGIOSTOMATOUS
PLAINCLOTHESMAN PLASMOLYTICALLY PLUMBAGINACEOUS POLYACRYLAMIDES
POSTMILLENARIAN PRAGMATICALNESS PRAGMATISATIONS PRAGMATIZATIONS
PREMILLENARIANS PROLETARIANISMS REACCLIMATISING REACTIONARYISMS
REAPPRAISEMENTS REHUMANIZATIONS REIMPLANTATIONS REMARKABILITIES
REMATERIALISING REMORALISATIONS REMORALIZATIONS RENORMALISATION
RETINOBLASTOMAS RHINOSCLEROMATA ROMANTICALITIES ROMANTICISATION
SABERMETRICALLY SABERMETRICIANS SACCHARIMETRIES SACCHAROMETRIES
SACRAMENTALISMS SACRAMENTALISTS SACRAMENTARIANS SADOMASOCHISTIC
SCAPHOCEPHALISM SCHEMATISATIONS SCHEMATIZATIONS SEISMOGRAPHICAL
SEMIABSTRACTION SEMIMANUFACTURE SEMIPARASITISMS SEMITRANSPARENT
SENSATIONALISMS SERVOMECHANICAL SLUMPFLATIONARY SOMATOLOGICALLY
SOMNAMBULATIONS SPERMATOBLASTIC SPIROCHAETAEMIA STALAGMITICALLY
STALAGMOMETRIES STIGMATISATIONS STIGMATIZATIONS STIGMATOPHILIAS
STOMATOPLASTIES SUBLAPSARIANISM SUBSTANTIALISMS SULFAMETHAZINES
SULPHACETAMIDES SULPHANILAMIDES SUPERNATURALISM SUPERPARASITISM
SYMPATHETICALLY SYMPTOMATICALLY SYNAPOSEMATISMS SYSTEMATISATION
SYSTEMATIZATION TATTERDEMALIONS TETRASPORANGIUM THAUMATOLATRIES
THERMAESTHESIAS THERMALISATIONS THERMALIZATIONS TOTALITARIANISM
TRADITIONALISMS TRANSAMINATIONS TRANSFORMATIONS TRANSILLUMINATE
TRANSMIGRATIONS TRANSMITTANCIES TRANSMUTABILITY TRANSMUTATIONAL
TRANSSEXUALISMS TRAUMATISATIONS TRAUMATIZATIONS TRAUMATONASTIES
TRIHALOMETHANES TRYPANOSOMIASES TRYPANOSOMIASIS UBIQUITARIANISM
ULTRALIBERALISM ULTRAMONTANISMS ULTRAMONTANISTS UNAMIABLENESSES
UNCOMPASSIONATE UNCOMPLAISANTLY UNFAMILIARITIES UNIFORMITARIANS
UNSECTARIANISMS UNSTATESMANLIKE UNTRANSMIGRATED UTILITARIANISMS