There are 609 thirteen-letter words containing A, H, O, P and T, https://www.bestwordlist.com/c/a/5/13letterwordswithahopt.htm ACETAMINOPHEN ACHROMATOPSIA ACTINOMORPHIC ACTINOTHERAPY ADIAPHORISTIC AETHRIOSCOPES ALLELOPATHIES ALPHABETIFORM AMPHICTYONIES AMPHIPROSTYLE AMPHISTOMATAL AMPHISTOMATIC AMPHITRICHOUS ANAPHYLACTOID ANTHOPHYLLITE ANTHROPOGENIC ANTHROPOLATRY ANTHROPOMETRY ANTHROPOMORPH ANTHROPOPATHY ANTHROPOPHAGI ANTHROPOPHAGY ANTHROPOPHYTE ANTHROPOSOPHY ANTIPHONARIES ANTIPSYCHOTIC ANTISTROPHONS AORTOGRAPHIES APHANIPTEROUS APHELIOTROPIC APOCHROMATISM APOPHLEGMATIC APOSTROPHISED APOSTROPHISES APOSTROPHIZED APOSTROPHIZES APOSTROPHUSES APOTHEGMATISE APOTHEGMATIST APOTHEGMATIZE APOTHEOSISING APOTHEOSIZING ARCHAEOPTERYX ARCTOPHILISTS ARITHMOPHOBIA ARTERIOGRAPHY ARTHROPATHIES ARTHROSCOPIES ARTHROSPOROUS ASPHYXIATIONS ASSOCIATESHIP ASTHENOSPHERE ASTRAPOPHOBIA ASTROPHYSICAL ATMOSPHERICAL ATTORNEYSHIPS AUTOBIOGRAPHY AUTOCEPHALIES AUTOCEPHALOUS AUTOGRAPHICAL AUTOMORPHISMS AZATHIOPRINES BACTERIOPHAGE BACTERIOPHAGY BALNEOTHERAPY BENTHOPELAGIC BIBLIOPHAGIST BIBLIOTHERAPY BLASTOSPHERES BLEPHAROPLAST BRACHYPTEROUS BREASTPLOUGHS CARDIOPATHIES CARTOGRAPHERS CARTOGRAPHIES CARTOPHILISTS CATASTROPHISM CATASTROPHIST CATHODOGRAPHS CATHODOGRAPHY CEPHALISATION CEPHALIZATION CEPHALOMETERS CEPHALOMETRIC CEPHALOTHORAX CEPHALOTOMIES CEROGRAPHISTS CHALCOPYRITES CHANNELOPATHY CHAPTERHOUSES CHARTOGRAPHER CHARTOGRAPHIC CHEMAUTOTROPH CHEMOAUTROPHS CHIROGRAPHIST CHIROPRACTICS CHIROPRACTORS CHLOROPLASTAL CHLOROPLASTIC CHROMATOGRAPH CHROMATOPHORE CHROMATOPSIAS CHROMOTHERAPY CHRONOTHERAPY CINEMATOGRAPH CLAUSTROPHOBE CLIMATOGRAPHY COADJUTORSHIP COAUTHORSHIPS CONSTABLESHIP CONTAINERSHIP COPARTNERSHIP COPROPHAGISTS COPYRIGHTABLE COSMOGRAPHIST CRYOTHERAPIES CRYPTOGRAPHER CRYPTOGRAPHIC CUSTODIANSHIP CYSTOGRAPHIES CYTOPATHOLOGY DACTYLOGRAPHY DEMOGRAPHISTS DEPHLEGMATION DEPHLEGMATORS DERMATOGRAPHY DERMATOPHYTES DERMATOPHYTIC DIAPHANOMETER DIAPHOTOTROPY DIASTROPHISMS DICTATORSHIPS DIPHTHONGALLY DITTOGRAPHIES DODECAPHONIST DRAUGHTPROOFS ELECTROGRAPHS ELECTROGRAPHY EMPHYSEMATOUS ENANTIOMORPHS ENANTIOMORPHY ENCEPHALOMATA ENCEPHALOTOMY ENDOLYMPHATIC ENHYPOSTASIAS ENHYPOSTATISE ENHYPOSTATIZE ENTEROPATHIES ENTOMOPHAGIES ENTOMOPHAGOUS EPITHELIOMATA EPITRACHELION ERGATOMORPHIC ERYTHROPENIAS ERYTHROPHOBIA ESOPHAGITIDES ESOPHAGITISES ETHNOGRAPHERS ETHNOGRAPHICA ETHNOGRAPHIES EXOPHTHALMIAS FELDSPATHOIDS GASTROSOPHERS GASTROSOPHIES GERONTOPHILIA GERONTOPHOBIA GLADIATORSHIP GLYPTOGRAPHER GLYPTOGRAPHIC GONADOTROPHIC GONADOTROPHIN GRAMOPHONISTS GRAPHOLOGISTS HAEMOPROTEINS HAGIOGRAPHIST HALIPLANKTONS HAPTOTROPISMS HARUSPICATION HECTOGRAPHIES HECTOGRAPHING HELIOTROPICAL HEMATOPHAGOUS HEMATOPOIESES HEMATOPOIESIS HEMATOPOIETIC HEPATECTOMIES HEPATISATIONS HEPATIZATIONS HEPATOLOGISTS HEPATOSCOPIES HEPTADECANOIC HERMAPHRODITE HERPETOFAUNAE HERPETOFAUNAS HETEROCARPOUS HETEROGRAPHIC HETEROPLASIAS HETEROPLASTIC HETEROPTERANS HETEROTYPICAL HIPPOCENTAURS HIPPOPHAGISTS HIPPOPOTAMIAN HOLOPARASITES HOLOPARASITIC HOLOPLANKTONS HOMEOPATHISTS HOMOEOPATHIES HOMOEOPATHIST HOMOEOTYPICAL HORRIPILATING HORRIPILATION HOSPITALISING HOSPITALITIES HOSPITALIZING HOUSEPAINTERS HYDNOCARPATES HYDROPATHICAL HYDROPATHISTS HYDROSULPHATE HYDROTHERAPIC HYETOGRAPHIES HYMENOPTERANS HYPERCAUTIOUS HYPERMETROPIA HYPERRATIONAL HYPERREACTORS HYPERROMANTIC HYPHENISATION HYPHENIZATION HYPNOANALYTIC HYPNOTISATION HYPNOTIZATION HYPOACIDITIES HYPOGNATHISMS HYPONATRAEMIA HYPONATRAEMIC HYPONATREMIAS HYPOPHOSPHATE HYPOPITUITARY HYPOSTASISING HYPOSTASIZING HYPOSTATISING HYPOSTATIZING HYPOSULPHATES HYPOTHECATING HYPOTHECATION HYPOTHECATORS HYPOXANTHINES HYPSOMETRICAL ICHTHYOPSIDAN IMMUNOTHERAPY IMPERATORSHIP IMPOSTHUMATED IMPOSTHUMATES INHOSPITALITY INTERHOSPITAL KINEMATOGRAPH LEPTOCEPHALIC LEPTOCEPHALUS LITHOGRAPHERS LITHOGRAPHIES LITHOGRAPHING LITHOLAPAXIES LYCANTHROPIES LYCANTHROPIST LYMPHOBLASTIC LYMPHOMATOSES LYMPHOMATOSIS MACHTPOLITIKS MAGNETOGRAPHS MAGNETOSPHERE MASTIGOPHORAN MASTIGOPHORES MASTIGOPHORIC MEDIATORSHIPS MESOTHERAPIES METALLOGRAPHY METALLOPHONES METAMORPHISMS METAMORPHISTS METAMORPHOSED METAMORPHOSES METAMORPHOSIS METAPHOSPHATE METENCEPHALON METEOROGRAPHS MISANTHROPIES MISANTHROPIST MODERATORSHIP MONOGRAPHISTS MONOPHOSPHATE MONOPHTHONGAL MONOTHERAPIES MULTIHOSPITAL MUSICOTHERAPY MYCETOPHAGOUS MYTHOGRAPHERS MYTHOGRAPHIES MYTHOPOETICAL NATUROPATHIES NEPHROPATHIES NEUROPATHICAL NEUROPATHISTS NONALPHABETIC NONPATHOGENIC NONPHOSPHATES ODONTOPHOBIAS ODONTOPHORANS OMMATOPHOROUS ONYCHOPHAGIST OPENHEARTEDLY OPHTHALMOLOGY OPISTHOBRANCH OPISTHOGRAPHS OPISTHOGRAPHY OPISTHOSOMATA ORGANOTHERAPY ORNITHOPHOBIA ORTHOCEPHALIC ORTHOEPICALLY ORTHOGRAPHERS ORTHOGRAPHIES ORTHOGRAPHIST ORTHOPAEDICAL ORTHOPAEDISTS ORTHOPINAKOID OSTEOGRAPHIES OSTEOPATHISTS OSTREOPHAGIES OSTREOPHAGOUS PAEDOTROPHIES PANCHROMATISM PANOPHTHALMIA PANTECHNICONS PANTHEOLOGIES PANTHEOLOGIST PANTOGRAPHERS PANTOGRAPHIES PANTOPHAGISTS PANTOTHENATES PARASYNTHETON PARATHORMONES PARTHENOCARPY PARTHENOGENIC PARTHENOSPORE PATHOGENICITY PATHOGNOMONIC PATHOGRAPHIES PATHOLOGISING PATHOLOGIZING PELOTHERAPIES PENTADELPHOUS PENTASTICHOUS PETROCHEMICAL PETROGRAPHERS PETROGRAPHIES PETROPHYSICAL PHAGOCYTISING PHAGOCYTIZING PHAGOCYTOSING PHALLOCENTRIC PHANEROPHYTES PHANTASMAGORY PHELLOPLASTIC PHENOBARBITAL PHENOMENALIST PHENOMENALITY PHENOTHIAZINE PHENTOLAMINES PHILANTHROPES PHILANTHROPIC PHILOMATHICAL PHLEBOTOMICAL PHLOGISTICATE PHONASTHENIAS PHONAUTOGRAPH PHONETISATION PHONETIZATION PHONOCAMPTICS PHONOGRAPHIST PHONOMETRICAL PHOSPHATIDYLS PHOSPHATISING PHOSPHATIZING PHOSPHATURIAS PHOSPHORATING PHOSPHORYLATE PHOTOCATHODES PHOTOCHEMICAL PHOTOCOPIABLE PHOTODYNAMICS PHOTOENGRAVED PHOTOENGRAVER PHOTOENGRAVES PHOTOGELATINE PHOTOGRAPHERS PHOTOGRAPHIES PHOTOGRAPHING PHOTOGRAPHIST PHOTOGRAVURES PHOTOMACHINES PHOTOMONTAGES PHOTONEGATIVE PHOTOREACTION PHOTOREACTIVE PHOTOREALISMS PHOTOREALISTS PHOTOSCANNING PHOTOSTATTING PHOTOSYNTHATE PHOTOTELEGRAM PHOTOVOLTAICS PHRAGMOPLASTS PHRASEOLOGIST PHREATOPHYTES PHREATOPHYTIC PHTHALOCYANIN PHYCOXANTHINS PHYSIOLATRIES PHYSIOTHERAPY PHYTOCHEMICAL PHYTOGRAPHERS PHYTOGRAPHIES PHYTONADIONES PHYTOPATHOGEN PHYTOPLANKTER PHYTOPLANKTON PHYTOSANITARY PICTOGRAPHIES PLECTOGNATHIC PLETHORICALLY PLETHYSMOGRAM PNEUMATOPHORE POLYARTHRITIS POLYCHROMATIC POLYCYTHAEMIA POLYCYTHEMIAS POLYGRAPHISTS POLYHISTORIAN POLYTECHNICAL POLYTHALAMOUS POLYURETHANES POSTAPARTHEID POSTHOLOCAUST POSTULANTSHIP POTICHOMANIAS PREADULTHOODS PREAUTHORIZED PREAUTHORIZES PREHISTORIANS PREHISTORICAL PROCATHEDRALS PROMETHAZINES PROMONARCHIST PROPHETICALLY PROPHYLACTICS PROSENCHYMATA PROSTANTHERAS PROSTHODONTIA PROTHETICALLY PROTOCHORDATE PROTOTHERIANS PSILANTHROPIC PSYCHOANALYST PSYCHOPATHICS PSYCHOPATHIES PSYCHOPATHIST PSYCHOSOMATIC PSYCHOTHERAPY PSYCHOTICALLY PTERYLOGRAPHY PTOCHOCRACIES PYRETOTHERAPY PYROCATECHINS PYROCATECHOLS PYROPHOSPHATE PYROSULPHATES PYROTECHNICAL QUAESTORSHIPS RADICULOPATHY RADIOPHONISTS RAPPROCHEMENT REFLECTOGRAPH REHOSPITALISE REHOSPITALIZE RELATIONSHIPS REPHOTOGRAPHS RETINOPATHIES RETROPHILIACS RHAMPHOTHECAE RHINOPLASTIES RHYTHMOPOEIAS RONTGENOGRAPH SAPROPHYTISMS SATANOPHANIES SATANOPHOBIAS SCLEROTHERAPY SCOPTOPHILIAS SCOPTOPHOBIAS SEROTHERAPIES SHARPSHOOTERS SHARPSHOOTING SNAPSHOOTINGS SOMATOTROPHIC SOMATOTROPHIN SOPHISTICALLY SOPHISTICATED SOPHISTICATES SOPHISTICATOR SOUSAPHONISTS SPATCHCOCKING SPECTATORSHIP SPECTROGRAPHS SPECTROGRAPHY SPELEOTHERAPY SPERMATOPHORE SPERMATOPHYTE SPERMATORRHEA SPERMATOTHECA SPHACELATIONS SPHAGNOLOGIST SPORTSMANSHIP STAPHYLOCOCCI STASIMORPHIES STEGANOGRAPHS STEGANOGRAPHY STENOGRAPHERS STENOGRAPHIES STENOGRAPHING STENOGRAPHIST STEPHANOTISES STEREOGRAPHED STEREOGRAPHIC STRATOSPHERES STRATOSPHERIC STROPHANTHINS STROPHIOLATED STYLOGRAPHIES SULPHONATIONS SULPHURATIONS SURROGATESHIP SYCOPHANTICAL SYCOPHANTISED SYCOPHANTISES SYCOPHANTISMS SYCOPHANTIZED SYCOPHANTIZES SYCOPHANTLIER SYCOPHANTRIES SYMPATHECTOMY SYMPATHOLYTIC SYPHILISATION SYPHILIZATION TACHISTOSCOPE TAPHROGENESES TAPHROGENESIS TAUROMORPHOUS TAUTOPHONICAL TECHNOPHILIAS TECHNOPHOBIAS TECHNOPOLITAN TELAUTOGRAPHY TELENCEPHALON TENORRHAPHIES TEPHROMANCIES TERATOPHOBIAS TERPSICHOREAL TERPSICHOREAN THANATOGRAPHY THANATOPHOBIA THEANTHROPIES THEANTHROPISM THEANTHROPIST THEATROPHONES THERMOGRAPHER THERMOGRAPHIC THERMOPLASTIC THERMOTHERAPY THIOSULPHATES THORACOPLASTY THORACOSCOPES THOROUGHPACED THROMBOPHILIA TOPOGRAPHICAL TOXICOPHAGOUS TOXICOPHOBIAS TRACHEOPHYTES TRAPEZOHEDRAL TRAPEZOHEDRON TRAPSHOOTINGS TREPHINATIONS TRICHOPTERANS TRIPHOSPHATES TROPHALLACTIC TROPHOBLASTIC TYPOGRAPHICAL TYPOGRAPHISTS UNPROPHETICAL URANOGRAPHIST VIBRAPHONISTS WEATHERPERSON WEATHERPROOFS XANTHOPTERINE XANTHOPTERINS XEROPHTHALMIA XEROPHTHALMIC XIPHIPLASTRON ZINJANTHROPUS