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There are 968 eighteen-letter words containing H, I, R, T and Y

(page 6)

psychoneuroticallypsychopharmaceuticpsychoprophylacticpsychotherapeuticspsychotherapeutistpsychrometric␣chartpsychrosensitivitypterylographicallypyelonephritogenicpyranoanthocyaninspyrheliometricallypyrophosphorolyticpyrophosphorylyticPythagorean␣triplesquantum␣field␣theoryquasithermodynamicradiation␣chemistryradiculomyelopathyradiculoneuropathyradiculoplexopathyradioimmunotherapyradiometallographyradiometeorographyrank-nullity␣theoremRayleigh␣scatteringreality␣pornographyRed␣Queen␣hypothesisrenohistopathologyrepeated␣bodily␣harmrephosphorylationsresynchronisationsresynchronizationsreticulated␣pythonsretinohypothalamicretinovasculopathyretrophylogenomicsretrosyntheticallyrhythmic␣gymnasticsrides␣the␣cotton␣ponyright␣lymphatic␣ductroyal␣straight␣flushrunning␣in␣the␣familyrusty␣sheriff's␣badgeSaint␣Anthony's␣crosssandplay␣therapistsSaturday␣night␣palsyscheduled␣territorySchnitzler␣syndromescimitar-horned␣oryxshoving␣it␣up␣your␣assSiberian␣rubythroatsignature␣authoritysling␣psychrometerssocial␣anthropologysodium␣hypochloritesouthern␣yellow␣pinespectrographicallyspectroheliographyspirocycloheptanesspondylarthritidesspondylotherapistsstakeholder␣societystatutory␣authoritysteganographicallystephanoberyciformsticky␣shed␣syndromestoichiometricallystorage␣hypervisorsstrontiopyrochloreSt␣Totteringham's␣Daystyrylisothiazolessublogarithmicallysubtherapeuticallysuper-heavy␣frigatessuperoleophobicitysuperphenomenalitysuperstoichiometrysympathetic␣powderssympathetic␣stringssympathoadrenergicsympathochromaffinsympathoexcitatorysympathoinhibitorssympathoinhibitorysymplectomorphismssynchiotrophoblastsynctiotrophoblastsystem␣architecturetautomorphemicallyTaylor-White␣processtelautographicallytelephone␣directorytephrostratigraphytertiary␣healthcaretertiary␣phosphinestetraethylammoniumtetrahexylammoniumtetrahydridoboratetetrahydrochloridetetrahydrocortisoltetrahydropyridinetetrahydrotriazinetetraiodothyroninetetramethylsilanestetramethylthiuramtetramethyluroniumtetrathiomolybdatetheoretical␣physicstheory␣of␣everythingtheory␣of␣relativitythermoacoustimetrythermoanalyticallythermoconductivitythermodynamic␣statethermoelectricallythermohydrodynamicthermoinducibilitythermomechanicallythermophoreticallythermophysiologiesthermoradiotherapythermoreflectivitythermoresponsivitythiocarbohydrazidethiocarboxylic␣acidthiophosphorylatedthiopyrophosphatesthree-dimensionallythree␣guys␣in␣a␣garagethrombocytogenesisthrombocytokineticthrombocytopaeniasthrombocytopathiesthrombocytopoiesisthrombocytopoieticthromboprophylaxisthrowaway␣ticketingThunder␣Bay␣Districtthyrocervical␣trunkthyrohyoid␣membranethyrotropic␣hormonetight␣pants␣syndrometiming␣is␣everythingtitan␣primary␣schoolTommy␣John␣surgeries

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 864 words
  • Spanish Wiktionary: no word
  • Italian Wiktionary: no word
  • German Wiktionary: 109 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 23 words

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