There are 439 fifteen-letter words containing 2A, H and T, https://www.bestwordlist.com/c/a/4/15letterwordswithaaht.htm
ACANTHOCEPHALAN ACCOUNTANTSHIPS ACHONDROPLASTIC ACHROMATICITIES
ACHROMATISATION ACHROMATIZATION ACROPARESTHESIA ACTINOTHERAPIES
ADIATHERMANCIES AFFRANCHISEMENT ALCOHOLISATIONS ALCOHOLIZATIONS
ALGORITHMICALLY ALPHABETISATION ALPHABETIZATION AMPHITHEATRICAL
ANACOLUTHICALLY ANAESTHESIOLOGY ANAESTHETICALLY ANARCHISTICALLY
ANESTHETISATION ANESTHETIZATION ANNIHILATIONISM ANTAPHRODISIACS
ANTHROPOLATRIES ANTHROPOLOGICAL ANTHROPOPATHIES ANTHROPOPATHISM
ANTHROPOPHAGIES ANTHROPOPHAGITE ANTHROPOPHAGOUS ANTHROPOPHOBIAS
ANTIALCOHOLISMS ANTIAPHRODISIAC ANTIARRHYTHMICS ANTICHRISTIANLY
ANTIDIARRHOEALS ANTIFASHIONABLE ANTIHISTAMINICS ANTILOGARITHMIC
ANTIMONARCHICAL ANTIMONARCHISTS ANTIPORNOGRAPHY ANTITHEORETICAL
APOPHTHEGMATISE APOPHTHEGMATIST APOPHTHEGMATIZE APOTHEGMATISING
APOTHEGMATIZING APPROACHABILITY ARACHNOIDITISES ARCHAEBACTERIUM
ARCHAEOBOTANIES ARCHAEOBOTANIST ARCHAEOMETRISTS ARCHAEOPTERYXES
ARCHEOASTRONOMY ARCHEOBOTANISTS ARCHEOMAGNETISM ARCHGENETHLIACS
ARCHIDIACONATES ARCHIEPISCOPATE ARCHITECTURALLY AROMATHERAPISTS
ARTERIOGRAPHIES ASTROPHOTOGRAPH ASTROPHYSICALLY ATMOSPHERICALLY
AUTHENTICATIONS AUTHORITATIVELY AUTOBIOGRAPHERS AUTOBIOGRAPHIES
AUTOGRAPHICALLY AUTOMORPHICALLY AUTORADIOGRAPHS AUTORADIOGRAPHY
AUTOSCHEDIASTIC AUTOSCHEDIAZING AUTOTROPHICALLY BACKSCRATCHINGS
BACTERIOPHAGIES BACTERIOPHAGOUS BALNEOTHERAPIES BATHOMETRICALLY
BATHYMETRICALLY BATRACHOPHOBIAS BENZANTHRACENES BIOMATHEMATICAL
BIOSTRATIGRAPHY BIPARTISANSHIPS BLETHERANSKATES BRACHYDACTYLIES
BRACHYDACTYLISM BRACHYDACTYLOUS BRACHYTHERAPIES BREATHABILITIES
BREATHARIANISMS CANTHAXANTHINES CATECHISTICALLY CATHETERISATION
CATHETERIZATION CATHODOGRAPHERS CATHODOGRAPHIES CATHOLICISATION
CATHOLICIZATION CEPHALOCHORDATE CEPHALOTHORACES CEPHALOTHORACIC
CEPHALOTHORAXES CHALCOGRAPHISTS CHANGEABILITIES CHANNELISATIONS
CHANNELIZATIONS CHANNELOPATHIES CHAPTALISATIONS CHAPTALIZATIONS
CHARACTERISABLE CHARACTERISTICS CHARACTERIZABLE CHARGEABILITIES
CHARTOGRAPHICAL CHEMOATTRACTANT CHEMOTACTICALLY CHORIOALLANTOIC
CHORIOALLANTOIS CHRESTOMATHICAL CHROMATOGRAPHED CHROMATOGRAPHER
CHROMATOGRAPHIC CHRONOGRAMMATIC CINEMATOGRAPHED CINEMATOGRAPHER
CINEMATOGRAPHIC CLAUSTROPHILIAS CLAUSTROPHOBIAS CLIMATOGRAPHIES
COMMANDANTSHIPS CRYPTAESTHESIAS CRYPTOGRAPHICAL CRYSTALLOGRAPHY
CYANOETHYLATING CYANOETHYLATION DACTYLOGRAPHERS DACTYLOGRAPHIES
DEHUMANISATIONS DEHUMANIZATIONS DERMATOGRAPHIAS DERMATOGRAPHIES
DETACHABILITIES DEXAMPHETAMINES DIAPHRAGMATITIS DIAPHRAGMITISES
DIASTROPHICALLY DISHABILITATING DISHABILITATION DITHIOCARBAMATE
DITHYRAMBICALLY DORSIBRANCHIATE DRAUGHTSMANSHIP EARTHSHATTERING
ECOCATASTROPHES EDRIOPHTHALMIAN ELEUTHEROMANIAS ENCEPHALOPATHIC
ERGATANDROMORPH ERYTHROMELALGIA ETHEREALISATION ETHEREALIZATION
EXCHANGEABILITY FATHEADEDNESSES GLUTARALDEHYDES GLYPTOGRAPHICAL
GNATHOSTOMATOUS GRANDFATHERLIER GRANDPARENTHOOD GRAPHITISATIONS
GRAPHITIZATIONS HABITABLENESSES HAEMACYTOMETERS HAEMAGGLUTINATE
HAEMAGGLUTININS HAEMOFLAGELLATE HALFHEARTEDNESS HALLUCINATIONAL
HARDHEARTEDNESS HARMONISTICALLY HEADMASTERLIEST HEADMASTERSHIPS
HEARTBREAKINGLY HEMAGGLUTINATED HEMAGGLUTINATES HEMOFLAGELLATES
HEPARINISATIONS HEPARINIZATIONS HEPATICOLOGICAL HEREDITARIANISM
HEREDITARIANIST HETEROGRAPHICAL HEXACHLORETHANE HIERARCHIZATION
HIEROGRAMMATIST HOLOBLASTICALLY HOMEOPATHICALLY HOMOPLASTICALLY
HOMOTRANSPLANTS HOSPITALISATION HOSPITALIZATION HUMANITARIANISM
HUMANITARIANIST HYDROPATHICALLY HYDROSTATICALLY HYDROXYAPATITES
HYDROXYLAPATITE HYPERAESTHESIAS HYPERCATABOLISM HYPERCATALECTIC
HYPERNATRAEMIAS HYPERPARASITISM HYPERSALIVATION HYPOSTASISATION
HYPOSTASIZATION HYPOSTATISATION HYPOSTATIZATION ICHTHYOSAURIANS
ICOSITETRAHEDRA INTERBEHAVIORAL INTERCHANGEABLE INTERCHANGEABLY
INTERPHALANGEAL ISOTHIOCYANATES KAFFEEKLATSCHES KATATHERMOMETER
KINEMATOGRAPHER KINEMATOGRAPHIC LABYRINTHICALLY LEUCOCYTHAEMIAS
LOGARITHMICALLY LOPHOBRANCHIATE LYMPHADENOPATHY LYMPHOADENOMATA
LYMPHOSARCOMATA MACHINABILITIES MACROPHOTOGRAPH MAGISTRATESHIPS
MAGNETOCHEMICAL MARSHMALLOWIEST MASOCHISTICALLY MASSOTHERAPISTS
MATHEMATICISING MATHEMATICIZING MATHEMATISATION MATHEMATIZATION
MATRIARCHALISMS MECHANISTICALLY MEGAGAMETOPHYTE MERCHANTABILITY
MESATICEPHALIES MESATICEPHALOUS METACHROMATISMS METALLOGRAPHERS
METALLOGRAPHIES METALLOGRAPHIST METAMATHEMATICS METAMORPHICALLY
METATHEORETICAL METHAMPHETAMINE MICROEARTHQUAKE MISCHARACTERISE
MISCHARACTERIZE MULTICHARACTERS NEPHROBLASTOMAS NEUROPATHICALLY
NONCARBOHYDRATE NONCHARISMATICS NONMATHEMATICAL NONMETAPHORICAL
NONPARTISANSHIP NONPARTIZANSHIP NORTHEASTWARDLY NOTHINGARIANISM
NUDIBRANCHIATES OCHLOCRATICALLY OLIGOCYTHAEMIAS OPHTHALMOPHOBIA
OPHTHALMOPLEGIA ORCHESTRATIONAL ORGANOGRAPHISTS ORGANOPHOSPHATE
ORGANOTHERAPIES ORTHOPAEDICALLY OSTEOPATHICALLY PALAEOANTHROPIC
PALAEOETHNOLOGY PALAEOGRAPHISTS PALAEONTOGRAPHY PALAEOPATHOLOGY
PALAEOPHYTOLOGY PANOPHTHALMITIS PANTHEISTICALLY PARAHELIOTROPIC
PARASYMPATHETIC PARENTHETICALLY PARTHENOCARPIES PARTHENOCARPOUS
PATRIARCHALISMS PHANTASMAGORIAL PHANTASMAGORIAS PHANTASMAGORIES
PHANTASMALITIES PHARMACEUTICALS PHARMACOGNOSIST PHARMACOGNOSTIC
PHARMACOKINETIC PHARMACOLOGISTS PHARMACOPOEISTS PHARMACOPOLISTS
PHARMACOTHERAPY PHILANTHROPICAL PHONAUTOGRAPHIC PHOSPHATISATION
PHOSPHATIZATION PHOTODEGRADABLE PHOTOMACROGRAPH PHOTOMECHANICAL
PHOTOTACTICALLY PHTHALOCYANINES PHYTOFLAGELLATE PLAINCLOTHESMAN
PREANAESTHETICS PROTHONOTARIATS PROTOSPATHAIRES PROTOSPATHARIUS
PSEUDAESTHESIAS PSYCHIATRICALLY PULMOBRANCHIATE RADICULOPATHIES
RADIOAUTOGRAPHS RADIOAUTOGRAPHY RADIOTELEGRAPHS RADIOTELEGRAPHY
RADIOTHERAPISTS REAUTHORISATION REAUTHORIZATION RECHROMATOGRAPH
REHABILITATIONS REHUMANIZATIONS RHEUMATOLOGICAL RHINOSCLEROMATA
SACCHARIMETRIES SACCHARISATIONS SACCHARIZATIONS SACCHAROMETRIES
SACCHAROMYCETES SADOMASOCHISTIC SAPROPHYTICALLY SARCENCHYMATOUS
SCHEMATISATIONS SCHEMATIZATIONS SEARCHABILITIES SHAMEFASTNESSES
SHERARDISATIONS SHERARDIZATIONS SPERMATORRHOEAS SPHAEROCRYSTALS
SPIROCHAETAEMIA STADTHOLDERATES STAPHYLOPLASTIC STAPHYLORRHAPHY
STEGANOGRAPHERS STEGANOGRAPHIES STEGANOGRAPHIST STEGOCEPHALIANS
STEREOGRAPHICAL STIGMATOPHILIAS STRAIGHTFORWARD STRAIGHTJACKETS
STRATIGRAPHICAL STRATIGRAPHISTS STRATOSPHERICAL SULFAMETHAZINES
SULPHACETAMIDES SULPHATHIAZOLES SYCOPHANTICALLY SYMPATHETICALLY
SYNARTHRODIALLY TACHOMETRICALLY TACHYARRHYTHMIA TACHYMETRICALLY
TEACHABLENESSES TECTIBRANCHIATE TELAUTOGRAPHIES TELEGRAPHICALLY
TETARTOHEDRALLY TETRABRANCHIATE TETRAETHYLLEADS TETRAHYDROFURAN
TETRAMETHYLLEAD THALAMENCEPHALA THALASSOCRACIES THALASSOGRAPHER
THALASSOGRAPHIC THALASSOTHERAPY THALATTOCRACIES THANATOGNOMONIC
THANATOGRAPHIES THAUMATOLATRIES THEATRICALISING THEATRICALITIES
THEATRICALIZING THEOREMATICALLY THERAPEUTICALLY THERMAESTHESIAS
THERMALISATIONS THERMALIZATIONS THERMOBAROGRAPH THERMODYNAMICAL
THIOBARBITURATE THORACOPLASTIES TOPOGRAPHICALLY TRANSHISTORICAL
TRICHOMONACIDAL TRIHALOMETHANES TYPOGRAPHICALLY ULTRAMARATHONER
ULTRASONOGRAPHY UNANAESTHETISED UNANAESTHETIZED UNAUTHENTICALLY
UNAUTHENTICATED UNAUTHORITATIVE UNCHANGEABILITY UNTEACHABLENESS
WARMHEARTEDNESS WEATHERBOARDING WEATHERISATIONS WEATHERIZATIONS
WELTANSCHAUUNGS WHATCHAMACALLIT ZYGOBRANCHIATES