There are 496 thirteen-letter words containing A, C, H, O and P, https://www.bestwordlist.com/c/a/5/13letterwordswithachop.htm ACCOMPLISHERS ACCOMPLISHING ACETAMINOPHEN ACHROMATOPSIA ACIDOPHILUSES ACTINOMORPHIC ACTINOTHERAPY ADIAPHORISTIC AETHRIOSCOPES AICHMOPHOBIAS AILOUROPHILIC AILOUROPHOBIC ALLELOMORPHIC AMPHICTYONIES AMPHISTOMATIC AMPHITRICHOUS ANAPHORICALLY ANAPHRODISIAC ANAPHYLACTOID ANCHORPERSONS ANGLOPHOBIACS ANTHROPOGENIC ANTIPSYCHOTIC APHELIOTROPIC APHRODISIACAL APOCHROMATISM APOPHLEGMATIC ARACHNOPHOBES ARACHNOPHOBIA ARACHNOPHOBIC ARCHAEOPTERYX ARCHBISHOPRIC ARCHIPELAGOES ARCHIPHONEMES ARCTOPHILISTS ARTHROSCOPIES ASSOCIATESHIP ASTROPHYSICAL ATMOSPHERICAL AUTOCEPHALIES AUTOCEPHALOUS AUTOGRAPHICAL BACHELORSHIPS BACTERIOPHAGE BACTERIOPHAGY BENTHOPELAGIC BIBLIOGRAPHIC BIOGEOGRAPHIC BIOPHYSICALLY BRACHYPTEROUS BRONCHOGRAPHY BRONCHOSPASMS CACOGRAPHICAL CACOPHONOUSLY CAMPHORACEOUS CANCEROPHOBIA CANCERPHOBIAS CAPNOGRAPHIES CARDIOGRAPHER CARDIOGRAPHIC CARDIOPATHIES CARTOGRAPHERS CARTOGRAPHIES CARTOPHILISTS CATASTROPHISM CATASTROPHIST CATHODOGRAPHS CATHODOGRAPHY CEPHALISATION CEPHALIZATION CEPHALOMETERS CEPHALOMETRIC CEPHALOPODANS CEPHALOPODOUS CEPHALORIDINE CEPHALOSPORIN CEPHALOTHORAX CEPHALOTOMIES CERAUNOGRAPHS CEROGRAPHICAL CEROGRAPHISTS CERVICOGRAPHY CHALCOGRAPHER CHALCOGRAPHIC CHALCOPYRITES CHAMPIONESSES CHAMPIONSHIPS CHANNELOPATHY CHAPTERHOUSES CHARTOGRAPHER CHARTOGRAPHIC CHEMAUTOTROPH CHEMOAUTROPHS CHIROGRAPHERS CHIROGRAPHIES CHIROGRAPHIST CHIROPRACTICS CHIROPRACTORS CHLAMYDOSPORE CHLOROPLASTAL CHLOROPLASTIC CHOREGRAPHERS CHOREGRAPHIES CHOREGRAPHING CHOREOGRAPHED CHOREOGRAPHER CHOREOGRAPHIC CHOREPISCOPAL CHOROGRAPHERS CHOROGRAPHIES CHROMATOGRAPH CHROMATOPHORE CHROMATOPSIAS CHROMOTHERAPY CHRONOGRAPHER CHRONOGRAPHIC CHRONOTHERAPY CINEMATOGRAPH CLAUSTROPHOBE CLIMATOGRAPHY COADJUTORSHIP COAUTHORSHIPS COCHAIRPERSON COLLEAGUESHIP COMMANDERSHIP COMPANIONHOOD COMPANIONSHIP CONSTABLESHIP CONTAINERSHIP COPARTNERSHIP COPROPHAGISTS COPROPHILIACS COPYRIGHTABLE CORPORALSHIPS CORRIVALSHIPS COSMOGRAPHERS COSMOGRAPHIES COSMOGRAPHIST CRYOTHERAPIES CRYPTOGRAPHER CRYPTOGRAPHIC CUSTODIANSHIP CYSTOGRAPHIES CYTOPATHOLOGY DACTYLOGRAPHY DEMOGRAPHICAL DERMATOPHYTIC DICTATORSHIPS DIENCEPHALONS DISCOGRAPHERS DISCOGRAPHIES DODECAPHONIES DODECAPHONISM DODECAPHONIST DOLICHOCEPHAL ELECTROGRAPHS ELECTROGRAPHY ENCEPHALOCELE ENCEPHALOGRAM ENCEPHALOMATA ENCEPHALOTOMY ENDOLYMPHATIC EPENCEPHALONS EPITRACHELION ERGATOMORPHIC ESOPHAGOSCOPE ESOPHAGOSCOPY ETHNOGRAPHICA FLUOROGRAPHIC FRANCOPHOBIAS GEOPHYSICALLY GLYPHOGRAPHIC GLYPTOGRAPHIC GONADOTROPHIC GRAPHOLOGICAL HAEMOPHILIACS HARUSPICATION HECTOGRAPHIES HECTOGRAPHING HELIOTROPICAL HEMATOPOIETIC HEPATECTOMIES HEPATOSCOPIES HEPTADECANOIC HETEROCARPOUS HETEROGRAPHIC HETEROPLASTIC HETEROTYPICAL HIERACOSPHINX HIPPOCENTAURS HIPPOCREPIANS HOLOPARASITIC HOMALOGRAPHIC HOMOEOTYPICAL HOMOLOGRAPHIC HYDNOCARPATES HYDROCEPHALIC HYDROCEPHALUS HYDROPATHICAL HYDROSCOPICAL HYDROTHERAPIC HYGROSCOPICAL HYPERCAUTIOUS HYPERREACTORS HYPERROMANTIC HYPERSARCOMAS HYPERSARCOSES HYPERSARCOSIS HYPNOANALYTIC HYPOACIDITIES HYPOCALCAEMIA HYPOCALCAEMIC HYPOCALCEMIAS HYPOCHONDRIAC HYPOCHONDRIAS HYPOCYCLOIDAL HYPOGLYCAEMIA HYPOGLYCAEMIC HYPOGLYCEMIAS HYPONATRAEMIC HYPOTHECATING HYPOTHECATION HYPOTHECATORS HYPSOMETRICAL ICHNOGRAPHIES ICHTHYOPSIDAN ICONOGRAPHERS ICONOGRAPHIES IDEOGRAPHICAL LEPTOCEPHALIC LEPTOCEPHALUS LEXICOGRAPHER LEXICOGRAPHIC LOGOGRAPHICAL LYCANTHROPIES LYCANTHROPIST LYMPHOBLASTIC LYMPHOGRAPHIC LYMPHOSARCOMA MACHTPOLITIKS MACROCEPHALIA MACROCEPHALIC MALACOPHILIES MALACOPHILOUS MARCONIGRAPHS MARSIPOBRANCH MASTIGOPHORIC MEGACEPHALOUS MEGALOCEPHALY MESENCEPHALON MESOCEPHALICS MESOCEPHALIES MESOCEPHALISM MESOCEPHALOUS METENCEPHALON MICROCEPHALIC MICROGRAPHERS MICROGRAPHICS MICROGRAPHIES MICROGRAPHING MICROPHYSICAL MONOGRAPHICAL MORPHEMICALLY MORPHOLOGICAL MUSICOTHERAPY MYCETOPHAGOUS MYTHOPOETICAL NARCOHYPNOSES NARCOHYPNOSIS NECROGRAPHERS NECROPHILIACS NEPHROLOGICAL NEUROPATHICAL NOMOGRAPHICAL NONALPHABETIC NONPATHOGENIC NONPHYSICIANS NYMPHAEACEOUS NYMPHOMANIACS OCEANOGRAPHER OCEANOGRAPHIC OCHLOPHOBIACS ONYCHOPHAGIES ONYCHOPHAGIST ONYCHOPHORANS OPISTHOBRANCH ORCHESOGRAPHY OREOGRAPHICAL ORGANOGRAPHIC ORTHOCEPHALIC ORTHOEPICALLY ORTHOPAEDICAL OSCILLOGRAPHS OSCILLOGRAPHY PACKINGHOUSES PAEDOPHILIACS PALAEOGRAPHIC PANCHROMATISM PANHARMONICON PANPHARMACONS PANSOPHICALLY PANTECHNICONS PARACHRONISMS PARAPSYCHOSES PARAPSYCHOSIS PARENCEPHALON PAROCHIALISED PAROCHIALISES PAROCHIALISMS PAROCHIALIZED PAROCHIALIZES PARTHENOCARPY PARTHENOGENIC PATHOGENICITY PATHOGNOMONIC PENTASTICHOUS PERICHONDRIAL PETROCHEMICAL PETROPHYSICAL PHAGOCYTISING PHAGOCYTIZING PHAGOCYTOSING PHALLOCENTRIC PHARMACOGNOSY PHARMACOLOGIC PHARMACOPEIAL PHARMACOPEIAS PHARMACOPOEIA PHARMACOPOEIC PHARYNGOSCOPE PHARYNGOSCOPY PHELLOPLASTIC PHILANTHROPIC PHILHARMONICS PHILOMATHICAL PHILOSOPHICAL PHLEBOGRAPHIC PHLEBOTOMICAL PHLEGMAGOGICS PHLOGISTICATE PHONOCAMPTICS PHONOMETRICAL PHOTOCATHODES PHOTOCHEMICAL PHOTOCOPIABLE PHOTODYNAMICS PHOTOMACHINES PHOTOREACTION PHOTOREACTIVE PHOTOSCANNING PHOTOVOLTAICS PHREATOPHYTIC PHRENOLOGICAL PHTHALOCYANIN PHYCOXANTHINS PHYSHARMONICA PHYSIOCRACIES PHYSIOGRAPHIC PHYSIOLOGICAL PHYTOCHEMICAL PICTOGRAPHIES PLAGIOCEPHALY PLECTOGNATHIC PLETHORICALLY POLAROGRAPHIC POLYCHROMATIC POLYCYTHAEMIA POLYCYTHEMIAS POLYTECHNICAL POSTHOLOCAUST POTICHOMANIAS PREHISTORICAL PROCATHEDRALS PROMONARCHIST PROPHETICALLY PROPHYLACTICS PROSENCEPHALA PROSENCHYMATA PROTHETICALLY PROTOCHORDATE PSEPHOLOGICAL PSILANTHROPIC PSYCHOANALYSE PSYCHOANALYST PSYCHOANALYZE PSYCHOBABBLED PSYCHOBABBLER PSYCHOBABBLES PSYCHODYNAMIC PSYCHOGRAPHIC PSYCHOLOGICAL PSYCHOMACHIAS PSYCHOMACHIES PSYCHOPATHICS PSYCHOPATHIES PSYCHOPATHIST PSYCHOSOMATIC PSYCHOTHERAPY PSYCHOTICALLY PTOCHOCRACIES PYROCATECHINS PYROCATECHOLS PYROTECHNICAL QUADRAPHONICS QUADRIPHONICS QUADROPHONICS RADICULOPATHY RAPPROCHEMENT RECHOREOGRAPH REFLECTOGRAPH REPROACHFULLY REPROACHINGLY REPROGRAPHICS RETROPHILIACS RHAMPHOTHECAE RHAPSODICALLY RHIZOCEPHALAN RHOPALOCEROUS SARCOPHAGUSES SCAPHOCEPHALI SCAPHOCEPHALY SCENOGRAPHERS SCENOGRAPHIES SCEUOPHYLACIA SCEUOPHYLAXES SCHIZOCARPOUS SCHIZOPHRENIA SCLEROTHERAPY SCOPOPHILIACS SCOPTOPHILIAS SCOPTOPHOBIAS SCROPHULARIAS SEISMOGRAPHIC SELENOGRAPHIC SHARECROPPERS SHARECROPPING SOMATOTROPHIC SOPHISTICALLY SOPHISTICATED SOPHISTICATES SOPHISTICATOR SPATCHCOCKING SPECTATORSHIP SPECTROGRAPHS SPECTROGRAPHY SPERMATOTHECA SPHACELATIONS SPHAGNICOLOUS SPLANCHNOCELE SPLANCHNOLOGY STAPHYLOCOCCI STEREOGRAPHIC STRATOSPHERIC SUBDEACONSHIP SYCOPHANTICAL SYCOPHANTISED SYCOPHANTISES SYCOPHANTISMS SYCOPHANTIZED SYCOPHANTIZES SYCOPHANTLIER SYCOPHANTRIES SYMPATHECTOMY SYMPATHOLYTIC SYMPHONICALLY TACHISTOSCOPE TAUTOPHONICAL TECHNOPHILIAS TECHNOPHOBIAS TECHNOPOLITAN TELENCEPHALON TEPHROMANCIES TERPSICHOREAL TERPSICHOREAN THERMOGRAPHIC THERMOPLASTIC THORACOPLASTY THORACOSCOPES THOROUGHPACED TOPOGRAPHICAL TOXICOPHAGOUS TOXICOPHOBIAS TRACHEOPHYTES TRICHOPTERANS TROPHALLACTIC TROPHOBLASTIC TYPOGRAPHICAL UNPROPHETICAL UNREPROACHFUL UNREPROACHING VENOGRAPHICAL XEROPHTHALMIC XYLOGRAPHICAL ZINCOGRAPHERS ZINCOGRAPHIES ZOOGEOGRAPHIC