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There are 895 eighteen-letter words containing H, O, P, R and Y

(page 4)

mercaptoethylaminemesopolysaccharidemetallographicallymetapyrocatechasesmethoxytryptophansmethylcyclopropanemethylotrophicallymethylprednisolonemethylprogesteronemethylprotodioscinmicrobrachytherapymicrohymenopteransmicrolissencephalymicrophanerophytesmicrophyllinic␣acidmicrophysiologicalmicrophytoplanktonmolecular␣pathologymonochlorobiphenylmonohydroperoxidesmonophosphorylatedmonophyletic␣groupsmorphoanatomicallymorphophonemicallymorphosemanticallymorphostratigraphymorphosyntacticianmucopolysaccharasemucopolysaccharideMurphy-Lane␣bone␣skidmycobacteriophagesmyeloradiculopathymyocardiodystrophynabalamprophyllitenanochromatographynanohydroxyapatitenasopharyngoscopesneoadjuvant␣therapyneoglyphioceratidsnephroureterectomyneuroendophenotypeneurolymphomatosisneuroophthalmology neuro-ophthalmologyneuropathogenicityneurophenomenologyneurophysiologicalneurophysiologistsneurophysiotherapyneuropsychiatristsneuropsychobiologyneuropsychodynamicneuropsychologicalneuropsychologistsneuropsychopathiesnonachlorobiphenylnondihydropyridinenonhyperandrogenicnonphosphorylatingnonphosphorylationnon-player␣characternonpolysaccharidesnonthienopyridinesnontopographicallyno␣peace␣for␣the␣wearynormophysiologicalnotoryctemorphiansnucleopolyhedrosisoctabromoporphyrinoctachlorobiphenyloligohymenophoreanoligohypomenorrheaoligoparaphenyleneon-the-fly␣encryptionophthalmotonometryorganoheterotrophyorthopantomographyorthopsychiatristsorthotypographicaloscillographicallyosteochondrophytesosteochondroplastyoverplayed␣one's␣handoverpsychologizingoxygen␣catastrophesPaal-Knorr␣synthesesPaal-Knorr␣synthesispachycephalosauridpachychoroidopathypachydermatousnesspachypleurosauridspachyrhizodontoidspalaeoanthropology palæoanthropologypalaeobiochemistrypalaeobiogeographypalaeogeochemistrypalaeohydrogeologypalaeohydrographicpalaeohydrologicalpalaeohydrologistspaleoanthropometrypaleogeomorphologypalynostratigraphypanhypopituitarismpanhypoproteinemiapanhypoproteinemicpapilioerythrinoneparacrocodylomorphparahydroxybenzeneparanasopharyngealparapodiapophysealparasympatholyticsparathyroid␣hormoneparthenocarpicallypassed␣under␣the␣yokepasses␣under␣the␣yokepatristic␣anthologypay␣the␣debt␣of␣naturepellitory␣of␣the␣wallpepsinhydrochloricperchloroethylenesperfluoropolyetherpersonality␣clashesperturbation␣theoryPeterborough␣Countyphaeochromocytomasphaerochromocytomaphanerocrystallinephantasmagoricallyphantom␣eye␣syndromepharmacogenotypingpharmacophenotypespharmacophoricallypharmacophysiologypharmacopsychiatrypharmacoresistancypharmacotoxicologypharyngealizationspharyngobranchialspharyngoepiglotticpharyngoesophagealpharyngointestinalpharyngolaryngitespharyngolaryngitispharyngotonsilitisphenylboronic␣acidsphenylcarbodiimidephenylchlorosilanepheochromocytomataphiloprogenitivelyphilosophers␣by␣fire

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 765 words
  • Spanish Wiktionary: no word
  • Italian Wiktionary: no word
  • German Wiktionary: 64 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 25 words

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