There are 591 twelve-letter words containing A, I, O, T and Y, https://www.bestwordlist.com/c/a/5/12letterwordswithaioty.htm
ABBREVIATORY ABOLITIONARY ABSORPTIVITY ABSTEMIOUSLY ACCOMPANYIST
ACCRETIONARY ACETYLATIONS ACOUSTICALLY ACROSTICALLY ACTINOMORPHY
ACTINOMYCETE ACTINOMYCINS ADDITIONALLY ADJUDICATORY ADMONITORILY
ADOPTABILITY AFFRONTINGLY AGROINDUSTRY AHISTORICITY ALCOHOLICITY
ALLOANTIBODY ALLOWABILITY AMBLYGONITES AMBULATORILY AMELIORATORY
AMITOTICALLY AMPHICTYONIC AMYLOPECTINS AMYOTROPHIES ANALYSATIONS
ANALYZATIONS ANATOMICALLY ANISODACTYLS ANNIHILATORY ANNUNCIATORY
ANTHOCYANINS ANTICIPATORY ANTICYCLONES ANTICYCLONIC ANTIHYDROGEN
ANTIMONOPOLY ANTIPHONALLY ANTIROYALIST ANTISOCIALLY AORISTICALLY
APERIODICITY APOCALYPTISM APOCALYPTIST APOCYNTHIONS APODYTERIUMS
APOLITICALLY APOPHYLLITES APOSTOLICITY APPOSITIVELY APPRECIATORY
AREOSYSTILES AROMATICALLY ARSENOPYRITE ARTICULATORY ARTIODACTYLS
ASPHYXIATION ASPHYXIATORS ASSIMILATORY ASTOUNDINGLY ASTROBIOLOGY
ASTROPHYSICS ASYMPTOMATIC ASYMPTOTICAL ATHROCYTOSIS ATTORNEYISMS
ATTORNEYSHIP AUDIOTYPINGS AUDIOTYPISTS AUTOANTIBODY AUTOECIOUSLY
AUTOHYPNOSIS AUTOHYPNOTIC AUTOIMMUNITY AUTOMATICITY AUTOMOBILITY
AUTOPTICALLY AYUNTAMIENTO BACTERIOLOGY BINOCULARITY BIOASTRONOMY
BIOCATALYSES BIOCATALYSIS BIOCATALYSTS BIOCATALYTIC CACHINNATORY
CAESPITOSELY CALAMITOUSLY CALIGINOSITY CALUMNIATORY CANTILLATORY
CAPITULATORY CARTOONISHLY CATEGORIALLY CATHODICALLY CATHOLICALLY
CATIONICALLY CHALCOPYRITE CHATOYANCIES CHRISTOPHANY CHROMATICITY
CITYFICATION CLAIRVOYANTS COGITATINGLY COGITATIVELY COLLEGIALITY
COLLEGIATELY COLLINEARITY COLLOIDALITY COLORABILITY COMMENSALITY
CONCILIATORY CONCOMITANCY CONCUBITANCY CONFIRMATORY CONFISCATORY
CONGENIALITY CONGENITALLY CONNUBIALITY CONSIGNATORY CONSPIRATORY
CONTAGIOUSLY CONTINUALITY CONTRACTIBLY CONTRIBUTARY CONVIVIALITY
COORDINATELY COPULATIVELY CORPOREALITY CORYBANTISMS COSMETICALLY
COUNTABILITY CROSSABILITY CRYPTOGAMIAN CRYPTOGAMIES CRYPTOGAMIST
CRYPTOMERIAS CRYPTOMNESIA CRYSTALLOIDS CYANIDATIONS CYANOGENETIC
CYBERNATIONS CYCLISATIONS CYCLIZATIONS CYCLOPAEDIST CYCLOTHYMIAC
CYCLOTHYMIAS CYTOCHALASIN CYTOCHEMICAL DACTYLIOLOGY DECORATIVELY
DEFAMATORILY DEFLATIONARY DEHYDRATIONS DENOTATIVELY DENUNCIATORY
DEPRECIATORY DEROGATIVELY DEROGATORILY DESOLATINGLY DESPOTICALLY
DETONABILITY DEVOTIONALLY DIALECTOLOGY DIALYSATIONS DIALYZATIONS
DIATONICALLY DICHOTICALLY DICTYOPTERAN DIOPTRICALLY DISASTROUSLY
DISCORDANTLY DISLOCATEDLY DISLOYALTIES DISPENSATORY DISSOCIALITY
DISTILLATORY DOCTRINALITY DOGMATICALLY DOMESTICALLY DOMINATINGLY
DYNAMOMETRIC ECOTYPICALLY EGOISTICALLY ELECTORIALLY ELOCUTIONARY
EMANCIPATORY EMOTIONALITY ENANTIOPATHY ENANTIOSTYLY ENANTIOTROPY
ENCYSTATIONS ENHYPOSTASIA ENHYPOSTATIC ENTROPICALLY ENZOOTICALLY
EPISTOLATORY EQUATIONALLY EQUATORIALLY EQUIVOCALITY EQUIVOCATORY
ERYTHROPENIA ERYTHROPSIAS ESOTERICALLY ETYMOLOGICAL EVOLUTIONARY
EXHILARATORY EXORBITANTLY EXOTERICALLY EXTORTIONARY FACILITATORY
FACTITIOUSLY FASTIDIOUSLY FAVORABILITY FICTIONALITY FLAGITIOUSLY
FLOATABILITY FORESTAYSAIL FORGEABILITY FRACTIONALLY FRICTIONALLY
FUNCTIONALLY GAMETOPHYTIC GELATINOUSLY GEODETICALLY GIGANTOMACHY
GRANULOCYTIC GRATUITOUSLY GYMNATORIUMS GYNECOCRATIC GYNECOMASTIA
GYNIOLATRIES GYROMAGNETIC HAEMATOLYSIS HAEMATOXYLIC HAEMATOXYLIN
HALOPHYTISMS HAMARTIOLOGY HELIOTHERAPY HEMATOXYLINS HEPATICOLOGY
HISTORICALLY HOLISTICALLY HOMEOTYPICAL HOMOPOLARITY HOMOTAXIALLY
HONORABILITY HORIZONTALLY HYDATIDIFORM HYDROELASTIC HYDROPATHICS
HYDROPATHIES HYDROPATHIST HYDROSTATICS HYETOGRAPHIC HYGROCHASTIC
HYLOPATHISMS HYLOPATHISTS HYPERACTIONS HYPHENATIONS HYPNOTICALLY
HYPNOTISABLE HYPNOTIZABLE HYPOCRITICAL HYPOGASTRIUM HYPOGNATHISM
HYPONATREMIA HYPONATREMIC HYPOPLASTIES HYPOSTASISED HYPOSTASISES
HYPOSTASIZED HYPOSTASIZES HYPOSTATICAL HYPOSTATISED HYPOSTATISES
HYPOSTATIZED HYPOSTATIZES HYPOSTHENIAS HYPOTHALAMIC HYPOTHERMIAS
HYPOTHETICAL HYPOXANTHINE HYSTEROMANIA ICHTHYOCOLLA ICHTHYOFAUNA
ICHTHYOLATRY ICHTHYOPHAGY ICHTHYOSAURI ICHTHYOSAURS IDEATIONALLY
IDOLATROUSLY ILLOGICALITY ILLUSTRATORY IMMODERATELY IMMOVABILITY
INAPPOSITELY INAUGURATORY INCAUTIOUSLY INCHOATIVELY INCOMMUTABLY
INCOMPATIBLY INCOMPUTABLY INCONSTANTLY INCRETIONARY INFLAMMATORY
INFLATIONARY INGRATIATORY INHOSPITABLY INNOVATIVELY INORDINATELY
INSOUCIANTLY INTERCOMPANY INTERLOCALLY INTIMIDATORY INTOLERANTLY
INTRACOMPANY IRRATIONALLY ISOENZYMATIC ISOTHERMALLY ISOTONICALLY
ISOTOPICALLY KAKISTOCRACY KARYOKINETIC KARYOLOGISTS KARYOTYPICAL
KEYBOARDISTS KYANISATIONS KYANIZATIONS LACHRYMATION LACHRYMOSITY
LOCATIONALLY LOGISTICALLY LOGNORMALITY LYCANTHROPIC LYMPHOMATOID
MACROCYTOSIS MANIPULATORY MARTYROLOGIC MATRILOCALLY MEMORABILITY
METEORICALLY METHODICALLY METHYLATIONS MICROANALYST MICROANATOMY
MICROCRYSTAL MICROGRAVITY MICROPAYMENT MICROTONALLY MINATORIALLY
MODIFICATORY MODULABILITY MOLECULARITY MONASTICALLY MONISTICALLY
MONITORIALLY MONOSYNAPTIC MOULDABILITY MUTATIONALLY MYCOBACTERIA
MYCODOMATIUM MYCOPHAGISTS MYELOBLASTIC MYELOPATHIES MYOFILAMENTS
MYOGRAPHISTS MYSTAGOGICAL MYTHOLOGIANS MYTHOLOGICAL MYTHOMANIACS
NARCOTICALLY NEMATOCYSTIC NEOTERICALLY NEUROTICALLY NEUROTYPICAL
NOCTURNALITY NOEMATICALLY NOMINATIVELY NONANALYTICS NONARBITRARY
NONENZYMATIC NONGENITALLY NONLINEARITY NONMIGRATORY NONSPATIALLY
NUTRITIONARY NYCTOPHOBIAS OBEDIENTIARY OBLIGATORILY OCCIDENTALLY
OCTOSYLLABIC OPERATICALLY OPINIONATELY OPPOSABILITY ORATORICALLY
ORBICULARITY ORGASTICALLY ORNITHOMANCY OSTEICHTHYAN OUTCRAFTYING
OUTLANDISHLY OVERACTIVITY OVERCAPACITY OVERLITERARY OVERMATURITY
OXYGENATIONS PACIFICATORY PALYNOLOGIST PANCYTOPENIA PANOPTICALLY
PANTISOCRACY PAPYROLOGIST PARALYSATION PARALYZATION PARASITOLOGY
PARASYMBIONT PARATHYROIDS PARATYPHOIDS PAROCHIALITY PASSIONATELY
PATHOBIOLOGY PATRILOCALLY PEJORATIVELY PERINATOLOGY PERITONEALLY
PERSPIRATORY PHAENOTYPING PHAGOCYTICAL PHAGOCYTISED PHAGOCYTISES
PHAGOCYTISMS PHAGOCYTIZED PHAGOCYTIZES PHAGOCYTOSIS PHAGOCYTOTIC
PHENOTYPICAL PHILANTHROPY PHONETICALLY PHONOTYPICAL PHOSPHATIDYL
PHOTODYNAMIC PHYCOXANTHIN PHYLLOTACTIC PHYLLOTAXIES PHYSIOCRATIC
PHYSIOLATERS PHYTOALEXINS PHYTOGRAPHIC PHYTOLOGICAL PHYTONADIONE
PHYTOPHAGIES PICTORICALLY PINEALECTOMY PLASTOCYANIN PLATINOTYPES
PLATONICALLY POLYAMORISTS POLYCYTHEMIA POLYGRAPHIST POLYMASTISMS
POLYSYNAPTIC POLYTONALISM POLYTONALIST POLYTONALITY PONTIFICALLY
POSITIONALLY POSTLIMINARY POSTSYNAPTIC POTENTIALITY PRAISEWORTHY
PROBATIONARY PROCTORIALLY PROFLIGATELY PROPHYLACTIC PROPITIATORY
PROSTACYCLIN PROTOTYPICAL PROVEABILITY PSAMMOPHYTIC PSILANTHROPY
PSYCHOACTIVE PSYCHOPATHIC PUNDITOCRACY PURIFICATORY PYRITOHEDRAL
PYROCATECHIN PYROCLASTICS PYROMAGNETIC PYROMETRICAL PYROTARTARIC
QUAESTIONARY QUESTIONABLY QUIXOTICALLY RADIOTHERAPY REFLATIONARY
REFRACTORILY REHYDRATIONS RELATIONALLY REMOVABILITY RENUNCIATORY
REVOCABILITY REVOKABILITY RHETORICALLY RHYTHMOPOEIA ROMANTICALLY
SALUTATORILY SAPROPHYTISM SATISFACTORY SCHIZOTHYMIA SCYPHISTOMAE
SCYPHISTOMAS SECRETIONARY SEIGNIORALTY SEMIOTICALLY SENATORIALLY
SHOCKABILITY SOLSTITIALLY SOMATOTYPING SOOTHSAYINGS SPASMOLYTICS
SPORTABILITY STATIONARILY STAYCATIONER STEATOPYGIAS STEREOACUITY
STICHOMYTHIA STRIDULATORY STYLISATIONS STYLIZATIONS STYLOGRAPHIC
SUBNORMALITY SUBOPTIMALLY SUPPLICATORY SYCOPHANTISE SYCOPHANTISH
SYCOPHANTISM SYCOPHANTIZE SYMPTOMATISE SYMPTOMATIZE SYNARTHROSIS
SYNCOPATIONS SYNDICATIONS SYNDIOTACTIC SYNOPTICALLY SYNTONICALLY
TECTONICALLY TENDINOPATHY THALLOPHYTIC THINGAMYBOBS THIOCYANATES
THORACICALLY TINCTORIALLY TOLERABILITY TORRENTIALLY TRADITIONARY
TRAITOROUSLY TRANSITORILY TRANSMOGRIFY TRICHOGYNIAL TRIDACTYLOUS
TROCHAICALLY TROCHOIDALLY TRYPANOCIDAL TRYPANOCIDES TRYPANOSOMIC
TYPIFICATION TYPOGRAPHIES TYPOGRAPHING TYPOGRAPHIST UNEROTICALLY
UNNOTICEABLY UNPOETICALLY UNPOPULARITY UNPROFITABLY VAPORABILITY
VASOACTIVITY VASODILATORY VATICINATORY VERIFICATORY VITUPERATORY
VOCATIONALLY VOLITIONALLY VOLUNTARYISM VOLUNTARYIST ZOOTOMICALLY
ZYGODACTYLIC