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