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