There are 517 fourteen-letter words containing A, 2E, H and T, https://www.bestwordlist.com/c/a/5/14letterwordswithaeeht.htm
ACETAMINOPHENS ACETYLCHOLINES AERENCHYMATOUS AESTHESIOGENIC AESTHETICISING
AESTHETICIZING AETHEREALITIES AFFREIGHTMENTS AIRTIGHTNESSES ALCOHOLOMETERS
ALMIGHTINESSES AMATEURISHNESS ANAESTHETISING ANAESTHETIZING ANESTHESIOLOGY
ANESTHETICALLY ANTHROPOGENIES ANTIMETATHESES ANTIMETATHESIS APOTHEGMATISED
APOTHEGMATISES APOTHEGMATIZED APOTHEGMATIZES APPRENTICEHOOD APPRENTICESHIP
ARCHAEBACTERIA ARCHAEOMETRIES ARCHAEOMETRIST ARCHEOBOTANIES ARCHGENETHLIAC
AROMATHERAPIES ASTHENOSPHERES ASTHENOSPHERIC AUTHENTICITIES AUTOSCHEDIAZED
AUTOSCHEDIAZES BACTERIOPHAGES BANDERSNATCHES BENZANTHRACENE BIGHEARTEDNESS
BLAMEWORTHIEST BLETHERANSKATE BREATHLESSNESS BRONCHIECTASES BUTYRALDEHYDES
CALYCANTHEMIES CANDLELIGHTERS CATECHETICALLY CATECHOLAMINES CATECHUMENATES
CATECHUMENICAL CATECHUMENISMS CATECHUMENSHIP CENTROLECITHAL CEPHALOMETRIES
CHARACTERISERS CHARACTERIZERS CHARITABLENESS CHARTERPARTIES CHEMOTHERAPIES
CHEMOTHERAPIST CHICKENHEARTED CHIEFTAINESSES CHIMNEYBREASTS CHLOROMETHANES
CHOLELITHIASES CHOLESTYRAMINE CHOLINESTERASE CHRESTOMATHIES CHROMATOSPHERE
COENAESTHESIAS COINHERITANCES COMETOGRAPHIES COUNTERCHANGED COUNTERCHANGES
COUNTERCHARGED COUNTERCHARGES COUNTERCHARMED COUNTERMARCHED COUNTERMARCHES
COUNTERTHREATS CROTONALDEHYDE CRYMOTHERAPIES CRYPTAESTHESIA CRYPTAESTHETIC
CRYPTESTHESIAS CURIETHERAPIES CYANOETHYLATED CYANOETHYLATES CYBERATHLETICS
CYPROHEPTADINE DAUGHTERLINESS DECAMETHONIUMS DECHRISTIANISE DECHRISTIANIZE
DEHYDROGENATED DEHYDROGENATES DEMETHYLATIONS DEPHLEGMATIONS DETACHEDNESSES
DEXAMETHASONES DEXAMPHETAMINE DIAPHANOMETERS DIATHERMANCIES DIATHERMANEITY
DICHLOROETHANE DIMENHYDRINATE DIMETHYLAMINES DISENCHANTMENT DISENCHANTRESS
DISENTHRALMENT DISESTABLISHED DISESTABLISHES DISHEARTENMENT DISINHERITANCE
DRAUGHTINESSES ECOCATASTROPHE ECTYPOGRAPHIES ELECTROCLASHES ELECTROGRAPHIC
ELECTROTHERAPY ELECTROTHERMAL ELEUTHEROMANIA EMPATHETICALLY EMPHATICALNESS
ENANTIOPATHIES ENCEPHALITIDES ENCEPHALITISES ENCEPHALITOGEN ENCEPHALOPATHY
ENDOTHELIOMATA ENHYPOSTATISED ENHYPOSTATISES ENHYPOSTATIZED ENHYPOSTATIZES
ENTERCHAUNGING ENTHYMEMATICAL EPHEMERALITIES EPHEMEROPTERAN EPITHELIALISED
EPITHELIALISES EPITHELIALIZED EPITHELIALIZES EPITHELISATION EPITHELIZATION
EPITRACHELIONS ESTABLISHMENTS ETHEREALNESSES ETHERIFICATION EXHAUSTIVENESS
EXHAUSTIVITIES EXOPHTHALMOSES EXOPHTHALMUSES EXOTHERMICALLY EXTINGUISHABLE
EXTRAVEHICULAR FAINTHEARTEDLY FAINTISHNESSES FAITHFULNESSES FARFETCHEDNESS
FARSIGHTEDNESS FATHERLESSNESS FATHERLINESSES FATHOMLESSNESS FEATHERBEDDING
FEATHERBRAINED FEATHERINESSES FEATHERWEIGHTS FINGERBREADTHS FLANNELMOUTHED
FRANCHISEMENTS GALEOPITHECINE GALEOPITHECOID GARNISHEEMENTS GASTIGHTNESSES
GEMEINSCHAFTEN GENETHLIACALLY GENETHLIALOGIC GENTLEMANHOODS GENTLEMANSHIPS
GESELLSCHAFTEN GLUTARALDEHYDE GREATHEARTEDLY HABITUALNESSES HAEMACYTOMETER
HAEMATOGENESES HAEMATOGENESIS HAEMATOGENETIC HAEMATOPOIESES HAEMATOPOIESIS
HAEMATOPOIETIC HAEMATOTHERMAL HAEMOCYTOMETER HALFWITTEDNESS HALTERBREAKING
HATELESSNESSES HATEMONGERINGS HEADMASTERLIER HEADMASTERSHIP HEADMISTRESSES
HEADQUARTERING HEADSTRONGNESS HEALTHLESSNESS HEARTRENDINGLY HEATHENISHNESS
HEAVYHEARTEDLY HELIOTHERAPIES HELLENISATIONS HELLENIZATIONS HEMACYTOMETERS
HEMAGGLUTINATE HEMIMETABOLOUS HEMOFLAGELLATE HEPATECTOMISED HEPATECTOMIZED
HEPATICOLOGIES HEPATOCELLULAR HEPATOMEGALIES HEPATOPANCREAS HEPHTHEMIMERAL
HEREDITABILITY HEREDITARINESS HERESTHETICIAN HERITABILITIES HERMAPHRODITES
HERPETOLOGICAL HETEROAROMATIC HETEROBLASTIES HETEROGAMETIES HETEROGLOSSIAS
HETEROGRAPHIES HETEROKARYOSES HETEROKARYOSIS HETEROKARYOTIC HETEROLECITHAL
HETEROPLASTIES HETEROPOLARITY HETEROSEXUALLY HETEROSOMATOUS HETEROTHALLIES
HETEROTHALLISM HEXACTINELLIDS HEXAMETHONIUMS HIEROGRAMMATES HOSPITABLENESS
HYDROTHERAPIES HYMENOPLASTIES HYPERACIDITIES HYPERACUTENESS HYPERAESTHESIA
HYPERAESTHESIC HYPERAESTHETIC HYPERALERTNESS HYPERCATALEXES HYPERCATALEXIS
HYPERDACTYLIES HYPEREMOTIONAL HYPERESTHESIAS HYPEREXCITABLE HYPERIRRITABLE
HYPERKERATOSES HYPERKERATOSIS HYPERKERATOTIC HYPERMETABOLIC HYPERMETROPIAS
HYPERNATRAEMIA HYPERPARASITES HYPERREALISTIC HYPERREALITIES HYPERSEXUALITY
HYPERSTIMULATE HYPERVENTILATE HYPNOTHERAPIES HYSTERETICALLY INCHOATENESSES
INHABITIVENESS INTERBEHAVIORS INTERBEHAVIOUR INTERWREATHING ISOGEOTHERMALS
LEACHABILITIES LEATHERINESSES LEATHERJACKETS LECYTHIDACEOUS LEPTOCEPHALOUS
LEUCOCYTHAEMIA LICENTIATESHIP LIEUTENANTSHIP LIGHTHEARTEDLY LOATHFULNESSES
MAGNETOSPHERES MAGNETOSPHERIC MASSOTHERAPIES MATHEMATICISED MATHEMATICISES
MATHEMATICIZED MATHEMATICIZES MECHANOTHERAPY MEGATECHNOLOGY MESATICEPHALIC
MESENCHYMATOUS MESOTHELIOMATA METABISULPHITE METALLOGRAPHER METAPHOSPHATES
METAPHYSICISED METAPHYSICISES METAPHYSICIZED METAPHYSICIZES METATHETICALLY
METENCEPHALONS METEOROGRAPHIC METHAEMOGLOBIN METHODICALNESS METHOXYFLURANE
METHYLXANTHINE MONOTHELETICAL MOUTHBREATHERS MULTICHAMBERED NARCOSYNTHESES
NEANDERTHALERS NEANDERTHALOID NEMATHELMINTHS NEURASTHENIACS NONACHIEVEMENT
NONESTABLISHED NONHALOGENATED NONTHEORETICAL NONTHERAPEUTIC NONTHREATENING
NORTHEASTERNER OESOPHAGITISES OPHTHALMOMETER ORTHOCEPHALIES OSTEOARTHROSES
OUTFANGTHIEVES OVERBREATHINGS OVERENTHUSIASM OVERHARVESTING OVERWEATHERING
OYSTERCATCHERS PALAEETHNOLOGY PAMPHLETEERING PANAESTHETISMS PARENTHESISING
PARENTHESIZING PARTHENOSPORES PATHLESSNESSES PETROCHEMICALS PHENETHYLAMINE
PHENMETRAZINES PHENOBARBITONE PHENOMENALISTS PHENOTHIAZINES PHENYLBUTAZONE
PHENYLTHIOUREA PHLEGMATICNESS PHOTOENGRAVERS PHOTOTELEGRAMS PHOTOTELEGRAPH
PHOTOTHERAPIES PHYTOGENETICAL PHYTOTHERAPIES PNEUMATOPHORES PNEUMOTHORACES
PNEUMOTHORAXES PRAISEWORTHIER PREANAESTHETIC PREESTABLISHED PREESTABLISHES
PSEUDAESTHESIA PSEUDARTHROSES PYRIMETHAMINES RADIESTHESISTS RADIOTELEGRAPH
RADIOTELEPHONE RADIOTELEPHONY RADIOTHERAPIES RAMAPITHECINES RAPPROCHEMENTS
REESTABLISHING REFASHIONMENTS REFLECTOGRAPHS REFLECTOGRAPHY REHABILITATIVE
REHOSPITALISED REHOSPITALISES REHOSPITALIZED REHOSPITALIZES REORCHESTRATED
REORCHESTRATES REPHOTOGRAPHED RETHEORIZATION RHEUMATOLOGIES ROENTGENOGRAPH
SACCHARIMETERS SACCHAROMETERS SCATTERMOUCHES SCHOOLMASTERED SCHOOLTEACHERS
SCLERENCHYMATA SCRATCHINESSES SECRETARYSHIPS SELENOGRAPHIST SHAMEWORTHIEST
SHAREABILITIES SLAUGHTERHOUSE SNAGGLETOOTHED SOFTHEADEDNESS SOMAESTHESISES
SOUTHEASTERNER SPERMATOPHORES SPERMATOPHYTES SPERMATORRHEAS SPERMATORRHOEA
SPERMATOTHECAE SPERMATOTHECAS SPHERICALITIES SPIROCHAETOSES STADHOLDERATES
STADTHOLDERATE STARCHEDNESSES STEALTHINESSES STEAMTIGHTNESS STEEPLECHASERS
STEEPLECHASING STEGANOGRAPHER STEGOCEPHALIAN STEGOCEPHALOUS STEREOCHEMICAL
STEREOGRAPHIES STEREOGRAPHING STOUTHEARTEDLY STRAIGHTNESSES SUBTHERAPEUTIC
SULFAMETHAZINE SULFONMETHANES SULPHACETAMIDE SULPHONMETHANE SUPERPHOSPHATE
SURCHARGEMENTS SWEETHEARTINGS TACHEOMETRICAL TEACHABILITIES TECHNICALITIES
TECHNOGRAPHIES TELENCEPHALONS TELEPATHICALLY TELEPHONICALLY TELEPHOTOGRAPH
TENDINOPATHIES TENDONOPATHIES TEREPHTHALATES TETARTOHEDRISM TETRACHLORIDES
TETRACHOTOMIES TETRAETHYLLEAD THANKFULNESSES THAUMATOGENIES THEATRICALISED
THEATRICALISES THEATRICALIZED THEATRICALIZES THEATRICALNESS THENCEFORWARDS
THERMAESTHESIA THERMESTHESIAS THERMOBALANCES THERMOCHEMICAL THERMOFORMABLE
THERMOGRAPHERS THERMOGRAPHIES THERMOMAGNETIC THERMOMETRICAL THERMOREGULATE
THERMOREMANENT THERMOTOLERANT THIABENDAZOLES THREADBARENESS THUNDERFLASHES
THYMELAEACEOUS TRACHEOSCOPIES TRACHEOSTOMIES TRACHYPTERUSES TRAPEZOHEDRONS
TREASURERSHIPS TRIETHYLAMINES TRIHALOMETHANE TRIIODOMETHANE TRIMETHADIONES
TRIMETHYLAMINE TRIPHENYLAMINE TSESAREVITCHES TSESAREWITCHES UNANESTHETISED
UNANESTHETIZED UNCHASTENESSES UNMERCHANTABLE VOUCHSAFEMENTS WATCHFULNESSES
WATERISHNESSES WATERTIGHTNESS WEATHERABILITY WEATHERBOARDED WEATHERCASTERS
WEATHERCOCKING WEATHERGLASSES WEATHERISATION WEATHERIZATION WEATHEROMETERS
WEATHERPERSONS WEATHERPROOFED WHATABOUTERIES WHOLEHEARTEDLY WHOREMASTERIES
WRATHFULNESSES XANTHOPTERINES