There are 476 thirteen-letter words containing A, E, I, O and Y, https://www.bestwordlist.com/c/a/5/13letterwordswithaeioy.htm
ABIOGENICALLY ABYSSOPELAGIC ACCIDENTOLOGY ACETYLCHOLINE ACRYLONITRILE
ACTINOMYCETES ACTINOMYCOSES ACTINOTHERAPY ADENOIDECTOMY AERODYNAMICAL
AEROLITHOLOGY AFFECTIONALLY ALLEGORICALLY ALUMINOTHERMY AMINOPHYLLINE
AMPHICTYONIES AMPHIPROSTYLE ANAEROBICALLY ANECDOTICALLY ANISOPHYLLIES
ANTHOPHYLLITE ANTIHYDROGENS ANTIOBSCENITY ANTIPREDATORY APERIODICALLY
APPROPRIATELY APPROXIMATELY ARSENOPYRITES ARTERIOGRAPHY ASSOCIATIVELY
ASSORTATIVELY ATTORNEYSHIPS AYUNTAMIENTOS BACTERIOLYSES BACTERIOLYSIN
BACTERIOLYSIS BACTERIOLYTIC BACTERIOPHAGY BASIDIOMYCETE BEHAVIOURALLY
BIBLIOTHECARY BIBLIOTHERAPY BIMOLECULARLY BIOCHEMICALLY BIOMETRICALLY
BIOSYSTEMATIC BISECTIONALLY CANYONEERINGS CARYOPTERISES CATEGORICALLY
CERTIFICATORY CERVICOGRAPHY CHALCOPYRITES CHIMNEYBOARDS CHLORARGYRITE
CHRYSOCRACIES CLAIRVOYANCES COESSENTIALLY COLLATERALITY COMMERCIALITY
COMMUTATIVELY COMPARATIVELY COMPLICATEDLY COMPLIMENTARY CONCEPTUALITY
CONCESSIONARY CONCRETIONARY CONFECTIONARY CONFESSIONARY CONFRATERNITY
CONNOTATIVELY CONSENTANEITY CONSIDERATELY CONSTRAINEDLY CONTERMINALLY
CONTINENTALLY CONTRACTIVELY CONTRASTIVELY CONVENTIONARY CONVERSIONARY
CONVEYANCINGS COOPERATIVELY COOPERATIVITY COPYRIGHTABLE CORRELATIVELY
CORRELATIVITY CRYOGENICALLY CRYOTHERAPIES CRYPTOMNESIAS CYANOBACTERIA
CYANOGENAMIDE CYBERCHONDRIA CYCLODIALYSES CYCLOPAEDISTS CYLINDRACEOUS
CYSTOGRAPHIES CYTODIAGNOSES CYTOGENETICAL DACTYLOLOGIES DECLAMATORILY
DECLARATORILY DEFORMABILITY DEMAGOGICALLY DEMETHYLATION DEMYELINATION
DEOXYGENATING DEOXYGENATION DEPLORABILITY DEPRECATORILY DERMATOPHYTIC
DEVOLUTIONARY DEVOTIONALITY DIALYPETALOUS DICHLAMYDEOUS DICTYOPTERANS
DIGRESSIONARY DIMENSIONALLY DIRECTORIALLY DISCRETIONARY DISORDINATELY
DOCUMENTARILY DYNAMOGENESIS DYNAMOMETRIES DYOTHELETICAL DYOTHELITICAL
EASYGOINGNESS ECCLESIOLATRY ECTOGENICALLY EDUCATIONALLY EFFICACIOUSLY
EGOMANIACALLY EGOTISTICALLY EMBRYOLOGICAL EMBRYONICALLY EMBRYOTICALLY
EMPLOYABILITY ENANTIOMORPHY ENCOURAGINGLY ENCROACHINGLY ENCYCLOPAEDIA
ENCYCLOPAEDIC ENCYCLOPEDIAN ENCYCLOPEDIAS ENDOLYMPHATIC ENHYPOSTASIAS
ENHYPOSTATISE ENHYPOSTATIZE ENZYMOLOGICAL EPIZOOTICALLY EQUILIBRATORY
EQUINOCTIALLY ERGONOMICALLY ERYSIPELATOUS ERYTHROPENIAS ERYTHROPHOBIA
ETHOLOGICALLY ETIOLOGICALLY EVAPORABILITY EXCEPTIONABLY EXCEPTIONALLY
EXCLAMATORILY EXPEDITIONARY EXPLANATORILY EXPLORATIVELY EXPONENTIALLY
EXPORTABILITY EXTEMPORARILY EXTENSIONALLY EXTERMINATORY EXTRAORDINARY
FERRICYANOGEN FERROCYANIDES FLAMBOYANCIES FORENSICALITY FORESTAYSAILS
FOREWARNINGLY GEMMIPAROUSLY GENETHLIALOGY GENITOURINARY GENOTYPICALLY
GEOCHEMICALLY GEODYNAMICIST GEOMETRICALLY GEOPHYSICALLY GEOSTATIONARY
GEOTACTICALLY GEOTROPICALLY GESTICULATORY GOVERNABILITY GYNAECOCRATIC
GYNAECOLOGIES GYNAECOLOGIST GYNAECOMASTIA GYNECOCRACIES GYNECOLOGICAL
GYNECOMASTIAS GYROMAGNETISM HAEMATOXYLINS HAEMODIALYSER HAEMODIALYSES
HAEMODIALYSIS HAEMODIALYZER HAEMODYNAMICS HALFSERIOUSLY HEMODIALYZERS
HERESIOGRAPHY HERNIORRHAPHY HETEROTYPICAL HOLIDAYMAKERS HOMILETICALLY
HOMOEOTYPICAL HOMOSEXUALITY HYALURONIDASE HYDROCEPHALIC HYDROGENATING
HYDROGENATION HYDROGRAPHIES HYDROMAGNETIC HYDROMETRICAL HYDROTHERAPIC
HYDROXYACETIC HYDROXYLAMINE HYETOGRAPHIES HYGROMETRICAL HYMNOGRAPHIES
HYPERBOLOIDAL HYPERCAUTIOUS HYPERMETROPIA HYPERPOLARISE HYPERPOLARIZE
HYPERPROSEXIA HYPERRATIONAL HYPERROMANTIC HYPERSARCOSIS HYPHENISATION
HYPHENIZATION HYPOACIDITIES HYPOCALCAEMIA HYPOCALCAEMIC HYPOCALCEMIAS
HYPOGLYCAEMIA HYPOGLYCAEMIC HYPOGLYCEMIAS HYPONATRAEMIA HYPONATRAEMIC
HYPONATREMIAS HYPOSPADIASES HYPOTHECATING HYPOTHECATION HYPOXANTHINES
HYPSOGRAPHIES HYPSOMETRICAL HYSTEROMANIAS IATROGENICITY ICHTHYOFAUNAE
IDEOLOGICALLY IMMOVEABILITY IMMUNOTHERAPY IMPASSIONEDLY IMPERSONALITY
IMPORTUNATELY INCONCEIVABLY INCONTESTABLY INCORPOREALLY INELABORATELY
INEXORABILITY INFLEXIONALLY INFORMATIVELY INOBSERVANTLY INOPERABILITY
INTENSIONALLY INTENTIONALLY INTERCOSTALLY INTERROGATORY INTOXICATEDLY
INTRAVENOUSLY INVENTORIALLY INVESTIGATORY IRRECOVERABLY ISOMETRICALLY
LARYNGOLOGIES LARYNGOTOMIES LYCANTHROPIES MARTYROLOGIES MASTOIDECTOMY
MEDIATORIALLY MERIDIONALITY METABOLICALLY METONYMICALLY MICROANALYSES
MICROPAYMENTS MONOGENICALLY MONUMENTALITY MORPHEMICALLY MUSICOTHERAPY
MYCOBACTERIAL MYCOBACTERIUM MYELOGRAPHIES MYOCARDITISES MYOELECTRICAL
MYTHOGRAPHIES MYTHOPOETICAL NEGOTIABILITY NONCREATIVITY NONDIALYSABLE
NONDIALYZABLE NONELASTICITY NONHAEMOLYTIC NONHEREDITARY NONHYSTERICAL
NONINVASIVELY NONMYELINATED NONSENSICALLY NONSYSTEMATIC NONTERMINALLY
NORMOGLYCEMIA NOTICEABILITY NUCLEONICALLY OBJECTIONABLY OBSERVABILITY
OBSESSIONALLY OBSTETRICALLY OECOLOGICALLY OECUMENICALLY OLEANDOMYCINS
OMNISEXUALITY ONTOGENICALLY ONYCHOMANCIES ONYCHOPHAGIES OPERATIONALLY
OPINIONATEDLY ORIGINATIVELY ORTHOEPICALLY OSTEICHTHYANS OVERANALYSING
OVERANALYZING OVERBEARINGLY OVERCANOPYING OVERSTABILITY PALAEOBIOLOGY
PALAEOCRYSTIC PANCREOZYMINS PANCYTOPENIAS PARASYMBIOSES PASSIONLESSLY
PATHOGENICITY PEDAGOGICALLY PENOLOGICALLY PEPTIDOGLYCAN PEREGRINATORY
PERIODONTALLY PERISSODACTYL PETROPHYSICAL PHENOMENALITY PHREATOPHYTIC
PHYSIOCRACIES PHYSIOGRAPHER PHYSIOLATRIES PHYSIOTHERAPY PHYTOCHEMICAL
PHYTOGRAPHIES PHYTONADIONES PLAGIOCEPHALY PLETHORICALLY PNEUMATOLYSIS
PNEUMATOLYTIC POLYBUTADIENE POLYCYTHAEMIA POLYCYTHEMIAS POLYDACTYLIES
POLYDAEMONISM POLYSILOXANES POLYTECHNICAL POLYVALENCIES PONDERABILITY
POSSESSIONARY PRAENOMINALLY PRASEODYMIUMS PRECAUTIONARY PREDOMINANTLY
PREDOMINATELY PREFATORIALLY PREPARATORILY PREROGATIVELY PRESBYACOUSIS
PRIMOGENITARY PROCESSIONARY PROLEPTICALLY PROPHETICALLY PROPRIETARILY
PROTHETICALLY PROVOCATIVELY PSYCHOMACHIES PSYCHOPATHIES PYELOGRAPHIES
PYRIDOXAMINES PYROBALLOGIES PYROCATECHINS PYROTECHNICAL RADIOACTIVELY
RADIOTELETYPE REASONABILITY RECIPROCALITY RECIPROCATORY RECRIMINATORY
REFORMABILITY REFRIGERATORY REKEYBOARDING REOXYGENATING REOXYGENATION
REPETITIONARY REPORTORIALLY REPROACHINGLY REPROBATIVELY RESOLVABILITY
RESTORATIVELY RETROACTIVELY RETROACTIVITY REVERSIONALLY REVOLUTIONARY
RHEOLOGICALLY RHYTHMOPOEIAS SALPINGECTOMY SANGUINOLENCY SAPROGENICITY
SARCOCYSTISES SCEUOPHYLACIA SEASONABILITY SEMEIOTICALLY SEMITONICALLY
SENSATIONALLY SEROLOGICALLY SOLDERABILITY SPECIFICATORY STAYCATIONERS
STEREOTYPICAL STYLOGRAPHIES SUBORDINATELY SUBVENTIONARY SUBVERSIONARY
SUPERLOYALIST SUPERMAJORITY SUPERORDINARY SYCOPHANTISED SYCOPHANTISES
SYCOPHANTIZED SYCOPHANTIZES SYCOPHANTLIER SYCOPHANTRIES SYMPTOMATISED
SYMPTOMATISES SYMPTOMATIZED SYMPTOMATIZES SYNAPOSEMATIC SYNECDOCHICAL
SYNECOLOGICAL SYRINGOMYELIA SYSTEMISATION SYSTEMIZATION TELEVISIONARY
TEMERARIOUSLY TERRITORIALLY TESTIFICATORY THEOLOGICALLY THEORETICALLY
THERMODYNAMIC TORRENTIALITY UNCOMBATIVELY UNCONCEIVABLY UNEMOTIONALLY
UNEQUIVOCABLY UNEQUIVOCALLY UNMENTIONABLY UNREASONINGLY VICEROYALTIES
ZYMOTECHNICAL