There are 463 thirteen-letter words containing A, H, I and Y, https://www.bestwordlist.com/c/a/4/13letterwordswithahiy.htm
ACETYLCHOLINE ACHLORHYDRIAS ACHROMATICITY ACTINOTHERAPY ADIATHERMANCY
ADMONISHINGLY AEROLITHOLOGY AESTHETICALLY AHISTORICALLY ALCOHOLICALLY
ALUMINOTHERMY AMINOPHYLLINE AMPHICTYONIES AMPHIDIPLOIDY AMPHIPROSTYLE
ANAPHORICALLY ANAPHYLACTOID ANISOPHYLLIES ANISOPHYLLOUS ANTHOPHYLLITE
ANTHRACYCLINE ANTIAUTHORITY ANTIHYDROGENS ANTIHYSTERICS ANTIPSYCHOTIC
ANYTHINGARIAN APATHETICALLY APPREHENSIBLY ARTERIOGRAPHY ARTHRITICALLY
ASPHYXIATIONS ASTHMATICALLY ASTONISHINGLY ASTROPHYSICAL ASYNCHRONISMS
ATHEISTICALLY ATHEMATICALLY ATTORNEYSHIPS AUTHENTICALLY AUTOBIOGRAPHY
BACTERIOPHAGY BATHYLIMNETIC BATHYMETRICAL BEHAVIOURALLY BIBLIOTHECARY
BIBLIOTHERAPY BIOCHEMICALLY BIOPHYSICALLY BRACHYPTERISM BREATHABILITY
BREATHALYSING BREATHALYZING CATHARTICALLY CERVICOGRAPHY CHALCOPYRITES
CHALLENGINGLY CHANGEABILITY CHARGEABILITY CHIMNEYBOARDS CHIMNEYBREAST
CHLORARGYRITE CHROMATICALLY CHROMATOLYSIS CHROMATOLYTIC CHRYSOCRACIES
CHYLIFICATION CHYMIFICATION CLAVICYTHERIA CLIMATOGRAPHY COPYRIGHTABLE
CRYOTHERAPIES CRYPTESTHESIA CRYPTOGRAPHIC CYBERCHONDRIA CYCLOTHYMIACS
CYSTOGRAPHIES CYTOCHALASINS DEMETHYLATING DEMETHYLATION DERMATOPHYTIC
DETACHABILITY DIAPHOTOTROPY DICHLAMYDEOUS DIETHYLAMIDES DIETHYLAMINES
DIGRAPHICALLY DIMETHYLAMINE DIPHENYLAMINE DIPHTHONGALLY DISHONOURABLY
DITHYRAMBISTS DYOTHELETICAL DYOTHELITICAL DYSAESTHESIAS ENANTIOMORPHY
ENCROACHINGLY ENDOLYMPHATIC ENHYPOSTASIAS ENHYPOSTATISE ENHYPOSTATIZE
EPIPHYTICALLY EPITHETICALLY ERYTHROPENIAS ERYTHROPHOBIA ETHOLOGICALLY
GENETHLIALOGY GEOCHEMICALLY GEOPHYSICALLY GLYPHOGRAPHIC GLYPTOGRAPHIC
GNATHONICALLY GRAPHEMICALLY HAEMATOXYLINS HAEMODIALYSER HAEMODIALYSES
HAEMODIALYSIS HAEMODIALYZER HAEMODYNAMICS HALFSERIOUSLY HALLUCINATORY
HEADMISTRESSY HEMODIALYZERS HEPTASYLLABIC HERESIOGRAPHY HERNIORRHAPHY
HETEROTYPICAL HEURISTICALLY HOLIDAYMAKERS HOMILETICALLY HOMOEOTYPICAL
HOMOLOGICALLY HOMOSEXUALITY HOMOSOCIALITY HONORIFICALLY HONOURABILITY
HORIZONTALITY HUBRISTICALLY HUMILIATINGLY HYALINISATION HYALINIZATION
HYALURONIDASE HYBRIDISATION HYBRIDIZATION HYDRARGYRISMS HYDRARTHROSIS
HYDRASTININES HYDRAULICALLY HYDRAULICKING HYDROCEPHALIC HYDROCRACKING
HYDRODYNAMICS HYDROGENATING HYDROGENATION HYDROGRAPHIES HYDROLYSATION
HYDROLYZATION HYDROMAGNETIC HYDROMETRICAL HYDROPATHICAL HYDROPATHISTS
HYDROSCOPICAL HYDROSTATICAL HYDROTHERAPIC HYDROTHORACIC HYDROXYACETIC
HYDROXYLAMINE HYDROXYLATING HYDROXYLATION HYETOGRAPHIES HYGROMETRICAL
HYGROSCOPICAL HYMNOGRAPHIES HYPAESTHESIAS HYPERACTIVITY HYPERACUITIES
HYPERALGESIAS HYPERBOLOIDAL HYPERCALCEMIA HYPERCALCEMIC HYPERCAUTIOUS
HYPERCHARGING HYPERCRITICAL HYPERESTHESIA HYPERGLYCEMIA HYPERINFLATED
HYPERKINESIAS HYPERLIPEMIAS HYPERMETRICAL HYPERMETROPIA HYPERPARASITE
HYPERPHRYGIAN HYPERPHYSICAL HYPERPOLARISE HYPERPOLARIZE HYPERPROSEXIA
HYPERPYREXIAL HYPERPYREXIAS HYPERRATIONAL HYPERREACTIVE HYPERREALISMS
HYPERREALISTS HYPERROMANTIC HYPERSALINITY HYPERSARCOSIS HYPERSTHENIAS
HYPERTHERMIAS HYPERURBANISM HYPERURICEMIA HYPERVARIABLE HYPERVIGILANT
HYPHENISATION HYPHENIZATION HYPNOANALYSIS HYPNOANALYTIC HYPNOTISATION
HYPNOTIZATION HYPOACIDITIES HYPOCALCAEMIA HYPOCALCAEMIC HYPOCALCEMIAS
HYPOCHONDRIAC HYPOCHONDRIAS HYPOCYCLOIDAL HYPOGLYCAEMIA HYPOGLYCAEMIC
HYPOGLYCEMIAS HYPOGNATHISMS HYPONATRAEMIA HYPONATRAEMIC HYPONATREMIAS
HYPOPITUITARY HYPOSPADIASES HYPOSTASISING HYPOSTASIZING HYPOSTATISING
HYPOSTATIZING HYPOTHECATING HYPOTHECATION HYPOXANTHINES HYPSOGRAPHIES
HYPSOMETRICAL HYSTEROMANIAS ICHTHYOCOLLAS ICHTHYOFAUNAE ICHTHYOFAUNAL
ICHTHYOFAUNAS ICHTHYOPSIDAN ICHTHYOSAURUS IMMUNOTHERAPY INEXHAUSTIBLY
INHARMONICITY INHOSPITALITY INTRATHECALLY ITHYPHALLUSES JELLYGRAPHING
KINDHEARTEDLY KINESITHERAPY LABYRINTHICAL LABYRINTHITIS LACHRYMATIONS
LANGUISHINGLY LETHARGICALLY LISSENCEPHALY LYCANTHROPIES LYCANTHROPIST
LYMPHADENITIS LYMPHANGIOMAS LYMPHATICALLY LYMPHOBLASTIC LYMPHOGRAPHIC
LYMPHOMATOSIS MACHINABILITY MESATICEPHALY METAPHYSICIAN METAPHYSICISE
METAPHYSICIST METAPHYSICIZE METAPSYCHICAL MICROPHYSICAL MONARCHICALLY
MORPHEMICALLY MUSICOTHERAPY MYELOGRAPHIES MYTHICISATION MYTHICIZATION
MYTHOGRAPHIES MYTHOPOETICAL NAPHTHYLAMINE NARCOHYPNOSIS NEARSIGHTEDLY
NIGHTMARISHLY NONHAEMOLYTIC NONHEREDITARY NONHYSTERICAL NONPHYSICIANS
NYMPHOMANIACS ONYCHOMANCIES ONYCHOPHAGIES ONYCHOPHAGIST OPISTHOGRAPHY
ORTHOEPICALLY ORTHOGONALITY OSCILLOGRAPHY OSTEICHTHYANS PANPSYCHISTIC
PANSOPHICALLY PARAPOPHYSIAL PARAPSYCHICAL PARAPSYCHISMS PARAPSYCHOSIS
PARASYNTHESIS PARASYNTHETIC PATHOGENICITY PATRIARCHALLY PERIPHERALITY
PERISHABILITY PETROPHYSICAL PHAGOCYTISING PHAGOCYTIZING PHAGOCYTOSING
PHANTASMALITY PHARISAICALLY PHARYNGITIDES PHARYNGITISES PHENOMENALITY
PHENYLALANINE PHENYLALANINS PHOSPHATIDYLS PHOTODYNAMICS PHREATOPHYTIC
PHRENETICALLY PHTHALOCYANIN PHYCOXANTHINS PHYLACTERICAL PHYSHARMONICA
PHYSICALISTIC PHYSICALITIES PHYSICALIZING PHYSICIANCIES PHYSICIANSHIP
PHYSIOCRACIES PHYSIOGRAPHER PHYSIOGRAPHIC PHYSIOLATRIES PHYSIOLOGICAL
PHYSIOTHERAPY PHYTOCHEMICAL PHYTOGRAPHIES PHYTONADIONES PHYTOSANITARY
PLAGIOCEPHALY PLATYCEPHALIC PLATYHELMINTH PLATYRRHINIAN PLAYWRIGHTING
PLETHORICALLY POLYARTHRITIS POLYCHROMATIC POLYCYTHAEMIA POLYCYTHEMIAS
POLYGRAPHISTS POLYHISTORIAN POLYTECHNICAL PREACHIFYINGS PROPHETICALLY
PROPHYLACTICS PROTHETICALLY PSYCHASTHENIA PSYCHASTHENIC PSYCHIATRICAL
PSYCHIATRISTS PSYCHODYNAMIC PSYCHOGRAPHIC PSYCHOLOGICAL PSYCHOMACHIAS
PSYCHOMACHIES PSYCHOPATHICS PSYCHOPATHIES PSYCHOPATHIST PSYCHOSOMATIC
PSYCHOTICALLY PUNISHABILITY PYELOGRAPHIES PYRIMETHAMINE PYRITHIAMINES
PYROCATECHINS PYROTECHNICAL RADICULOPATHY REPROACHINGLY RHAPSODICALLY
RHEOLOGICALLY RHEUMATICALLY RHYTHMISATION RHYTHMIZATION RHYTHMOPOEIAS
SACCHARIFYING SACCHARIMETRY SAPROPHYTISMS SCEUOPHYLACIA SCHEMATICALLY
SCHIZOTHYMIAS SEARCHABILITY SECRETARYSHIP SHAMBOLICALLY SKETCHABILITY
SOPHISTICALLY SPATHIPHYLLUM STANDOFFISHLY STAPHYLINIDAE STAPHYLITISES
STAPHYLOCOCCI STAYSTITCHING STICHOMYTHIAS STRAIGHTAWAYS STYLOGRAPHIES
SUPERHIGHWAYS SUPERHUMANITY SUPERPHYSICAL SYCOPHANTICAL SYCOPHANTISED
SYCOPHANTISES SYCOPHANTISMS SYCOPHANTIZED SYCOPHANTIZES SYCOPHANTLIER
SYCOPHANTRIES SYMPATHETICAL SYMPATHOLYTIC SYMPHONICALLY SYNADELPHITES
SYNAESTHESIAS SYNARTHRODIAL SYNECDOCHICAL SYNTHETICALLY SYPHILISATION
SYPHILIZATION SYPHILOPHOBIA TACHYGRAPHIES TACHYGRAPHIST TACHYMETRICAL
TACHYPHRASIAS TACHYPHYLAXIS THANKWORTHILY THEATRICALITY THEOLOGICALLY
THEORETICALLY THERMODYNAMIC THRASONICALLY THREATENINGLY TRIETHYLAMINE
TYPOGRAPHICAL TYPOGRAPHISTS ULTRAPHYSICAL UNCHRISTIANLY UNFASHIONABLY
UNIMPEACHABLY UNSYMPATHETIC UNTHRIFTYHEAD WHILLYWHAWING XYLOGRAPHICAL
YACHTSMANSHIP ZYGAPOPHYSIAL ZYMOTECHNICAL