There are 408 fourteen-letter words containing A, E, H and Y, https://www.bestwordlist.com/c/a/4/14letterwordswithaehy.htm
ACETYLCHOLINES AERENCHYMATOUS AEROHYDROPLANE ALPHABETICALLY ALPHAMERICALLY
AMINOPHYLLINES AMPHIPROSTYLES ANDROGYNOPHORE ANESTHESIOLOGY ANESTHETICALLY
ANTHOPHYLLITES ANTHRACYCLINES ANTHROPOPHYTES ANTITECHNOLOGY ANTITHETICALLY
APOCRYPHALNESS APPREHENSIVELY ARCHAEOZOOLOGY ARCHETYPICALLY ARITHMETICALLY
ASTROCHEMISTRY AZIDOTHYMIDINE BIOARCHAEOLOGY BLEPHAROPLASTY BRACHYCEPHALIC
BRACHYGRAPHIES BRACHYPTERISMS BREATHTAKINGLY BUTYRALDEHYDES CALYCANTHEMIES
CATECHETICALLY CHARACTEROLOGY CHIMNEYBREASTS CHLAMYDOSPORES CHLORARGYRITES
CHLOROARGYRITE CHOLESTYRAMINE CHRYSANTHEMUMS CINEMATOGRAPHY CLAVICYTHERIUM
COELANAGLYPHIC CROTONALDEHYDE CRYMOTHERAPIES CRYPTAESTHESIA CRYPTAESTHETIC
CRYPTESTHESIAS CRYPTOGRAPHERS CRYPTOGRAPHIES CYANOETHYLATED CYANOETHYLATES
CYBERATHLETICS CYBERCHONDRIAC CYBERCHONDRIAS CYCLANTHACEOUS CYCLOHEXANONES
CYPROHEPTADINE CYSTOLITHIASES CYTOPATHOGENIC DACTYLOGRAPHER DEHYDROGENASES
DEHYDROGENATED DEHYDROGENATES DEMETHYLATIONS DERMATOGLYPHIC DIATHERMANEITY
DIMENHYDRINATE DIMETHYLAMINES DIPHENYLAMINES DOLICHOCEPHALY DYSMENORRHOEAL
DYSMENORRHOEAS EARTHSHAKINGLY ECTOMYCORRHIZA ECTYPOGRAPHIES ELECTROTHERAPY
EMPATHETICALLY ENCEPHALOPATHY ENDOCRINOPATHY ENDOMYCORRHIZA ENDOPHYTICALLY
ENHARMONICALLY ENHYPOSTATISED ENHYPOSTATISES ENHYPOSTATIZED ENHYPOSTATIZES
ENIGMATOGRAPHY ENTHYMEMATICAL EPIGRAPHICALLY EPISTOLOGRAPHY ERYTHROBLASTIC
ERYTHROPHOBIAS ETHNOLOGICALLY EUPHUISTICALLY EXHAUSTIBILITY EXHILARATINGLY
EXOTHERMICALLY FAINTHEARTEDLY FURFURALDEHYDE GENETHLIACALLY GEOGRAPHICALLY
GLUTARALDEHYDE GLYCERALDEHYDE GLYPHOGRAPHERS GLYPHOGRAPHIES GLYPTOGRAPHERS
GLYPTOGRAPHIES GREATHEARTEDLY HAEMACYTOMETER HAEMOCYTOMETER HAEMODIALYSERS
HAEMODIALYZERS HALFPENNYWORTH HEARTRENDINGLY HEAVYHEARTEDLY HEDONISTICALLY
HEMACYTOMETERS HEPATOTOXICITY HEREDITABILITY HETEROKARYOSES HETEROKARYOSIS
HETEROKARYOTIC HETEROPOLARITY HETEROSEXUALLY HIERARCHICALLY HIEROGLYPHICAL
HISTOGENICALLY HYALURONIDASES HYDROCEPHALICS HYDROCEPHALIES HYDROCEPHALOID
HYDROCEPHALOUS HYDROCORALLINE HYDROEXTRACTOR HYDROGENATIONS HYDROKINETICAL
HYDROMAGNETICS HYDROMECHANICS HYDROPNEUMATIC HYDROSULPHATES HYDROTHERAPIES
HYDROTHERAPIST HYDROTHERMALLY HYDROXYAPATITE HYDROXYLAMINES HYETOGRAPHICAL
HYMENOPLASTIES HYPERACIDITIES HYPERACUTENESS HYPERAESTHESIA HYPERAESTHESIC
HYPERAESTHETIC HYPERALERTNESS HYPERAWARENESS HYPERBARICALLY HYPERBATICALLY
HYPERBOLICALLY HYPERCALCAEMIA HYPERCALCAEMIC HYPERCALCEMIAS HYPERCATABOLIC
HYPERCATALEXES HYPERCATALEXIS HYPERDACTYLIES HYPEREMOTIONAL HYPERESTHESIAS
HYPEREXCITABLE HYPERGLYCAEMIA HYPERGLYCAEMIC HYPERGLYCEMIAS HYPERGOLICALLY
HYPERINFLATION HYPERIRRITABLE HYPERKERATOSES HYPERKERATOSIS HYPERKERATOTIC
HYPERLIPIDEMIA HYPERMASCULINE HYPERMETABOLIC HYPERMETROPIAS HYPERNATRAEMIA
HYPERPARASITES HYPERPARASITIC HYPERPITUITARY HYPERPOLARISED HYPERPOLARISES
HYPERPOLARIZED HYPERPOLARIZES HYPERPROSEXIAS HYPERREALISTIC HYPERREALITIES
HYPERROMANTICS HYPERSARCOMATA HYPERSEXUALITY HYPERSONICALLY HYPERSTIMULATE
HYPERTROPHICAL HYPERURBANISMS HYPERURICAEMIA HYPERURICEMIAS HYPERVENTILATE
HYPERVIGILANCE HYPHENISATIONS HYPHENIZATIONS HYPNOTHERAPIES HYPNOTHERAPIST
HYPOALLERGENIC HYPOCALCAEMIAS HYPODERMICALLY HYPOGLYCAEMIAS HYPOMAGNESEMIA
HYPOMENORRHEAS HYPOMENORRHOEA HYPONATRAEMIAS HYPOPHOSPHATES HYPOTHECATIONS
HYPOTHETICALLY HYSTERETICALLY IATROCHEMISTRY ICHTHYOLATRIES ICHTHYOPHAGIES
IMMETHODICALLY IMPEACHABILITY INAUTHENTICITY INDECIPHERABLY INHERITABILITY
IRREPROACHABLY ISOTHIOCYANATE KINEMATOGRAPHY LACHRYMATORIES LACHRYMOSITIES
LARYNGOPHONIES LECYTHIDACEOUS LEUCOCYTHAEMIA LIGHTHEARTEDLY LYMPHANGITIDES
LYMPHANGITISES LYMPHOADENOMAS LYMPHOGRAPHIES MACHINEABILITY MATHEMATICALLY
MECHANOTHERAPY MEGAPHONICALLY MEGASPOROPHYLL MEGATECHNOLOGY MESENCHYMATOUS
METAPHORICALLY METAPHYSICALLY METAPHYSICIANS METAPHYSICISED METAPHYSICISES
METAPHYSICISTS METAPHYSICIZED METAPHYSICIZES METAPSYCHOLOGY METATHETICALLY
METHOXYFLURANE METHYLXANTHINE MORPHOSYNTAXES MUDDLEHEADEDLY MYELENCEPHALIC
MYELENCEPHALON MYRMECOPHAGOUS NANOTECHNOLOGY NAPHTHYLAMINES NARCOSYNTHESES
NARCOSYNTHESIS NASOPHARYNGEAL NEUROPATHOLOGY NONTECHNICALLY OESOPHAGOSCOPY
OLIGOCYTHAEMIA OPHTHALMOMETRY ORTHOGENICALLY ORTHOPEDICALLY OXYHAEMOGLOBIN
OYSTERCATCHERS PACHYDERMATOUS PALAEETHNOLOGY PALEOGEOGRAPHY PALEOPATHOLOGY
PARENCHYMATOUS PAROEMIOGRAPHY PHARYNGOLOGIES PHARYNGOSCOPES PHARYNGOTOMIES
PHENETHYLAMINE PHENOLOGICALLY PHENOTYPICALLY PHENYLALANINES PHENYLBUTAZONE
PHENYLTHIOUREA PHILATELICALLY PHLEGMATICALLY PHONEMATICALLY PHOSPHORYLASES
PHOSPHORYLATED PHOSPHORYLATES PHOTOCATALYSES PHOTOGENICALLY PHOTOGRAMMETRY
PHOTOSYNTHATES PHOTOTHERMALLY PHTHALOCYANINE PHYLLOSILICATE PHYSICALNESSES
PHYSIOGRAPHERS PHYSIOGRAPHIES PHYTOCHEMICALS PHYTOGENETICAL PHYTOGEOGRAPHY
PHYTOPATHOGENS PHYTOPLANKTERS PHYTOTHERAPIES PICAYUNISHNESS PLATYCEPHALOUS
PLATYHELMINTHS PLETHYSMOGRAMS PLETHYSMOGRAPH PLEURAPOPHYSES PLEURAPOPHYSIS
POLYCYTHAEMIAS POLYPHARMACIES POLYSACCHARIDE POLYSACCHAROSE POLYTHEISTICAL
PRAISEWORTHILY PROSTHETICALLY PSEPHOANALYSES PSEPHOANALYSIS PSEUDEPIGRAPHY
PSYCHASTHENIAS PSYCHASTHENICS PSYCHOANALYSED PSYCHOANALYSER PSYCHOANALYSES
PSYCHOANALYZED PSYCHOANALYZER PSYCHOANALYZES PSYCHOBABBLERS PSYCHOCHEMICAL
PSYCHOGRAPHIES PSYCHOMETRICAL PSYCHOSEXUALLY PTERYLOGRAPHIC PYRIMETHAMINES
PYROCHEMICALLY PYROPHOSPHATES PYROTECHNICIAN RADIOCHEMISTRY RADIOTELEPHONY
REFLECTOGRAPHY RHABDOMYOLYSES RHEUMATOIDALLY RHYPAROGRAPHER RONTGENOGRAPHY
SCEUOPHYLACIUM SCHOOLMASTERLY SCLERENCHYMATA SECRETARYSHIPS SEMAPHORICALLY
SHILLYSHALLIED SHILLYSHALLIER SHILLYSHALLIES SLAUGHTEROUSLY SPAGHETTIFYING
SPERMATOPHYTES SPERMATOPHYTIC SPHAEROCRYSTAL SPHEROIDICALLY STOUTHEARTEDLY
STRETCHABILITY SULPHONYLUREAS SYCOPHANTLIEST SYMMETROPHOBIA SYNAPOMORPHIES
SYNCHROFLASHES SYNTHESISATION SYNTHESIZATION SYNTHETISATION SYNTHETIZATION
TELEPATHICALLY TELEPHONICALLY TETRAETHYLLEAD THEOCRATICALLY THEOSOPHICALLY
THERMODYNAMICS THERMOLABILITY THYMELAEACEOUS THYSANOPTEROUS TRACHYPTERUSES
TRIETHYLAMINES TRIMETHYLAMINE TRIPHENYLAMINE TURBOMACHINERY UNATHLETICALLY
UNAUTHENTICITY UNDECIPHERABLY UNEMPHATICALLY UNHESITATINGLY UNHYSTERICALLY
UNMETAPHYSICAL UNPRAISEWORTHY UNTHRIFTYHEADS WEATHERABILITY WHOLEHEARTEDLY
XENOPHOBICALLY XEROPHYTICALLY ZYGOBRANCHIATE