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There are 872 eighteen-letter words containing H, P, S and Y

(page 5)

plethysmographicalpolychemotherapiespolychromatophilespolyesterurethanespolyethersulphonespolyethyleneiminespolyhydric␣alcoholspolyhydroxyphenolspolymorphonuclearspolypharmacologiespolyphenoloxidasespolyphenylalanines poly-phenylalaninespolyphosphoric␣acidpolyphosphorylatedpolyplethysmographpolysomnographicalpolysomnographistspolysporangiophytepolyvinylchlorides polyvinyl␣chloridespops␣someone's␣cherryportal␣hypertensionpositional␣asphyxiapostpsychoanalyticpotassium␣hydroxidepour␣honey␣in␣one's␣earpreanaestheticallyprephosphorylatingprephosphorylationpresynchronizationpretty␣horsebreakerproofs␣by␣exhaustionprosecution␣historyproselyte␣of␣the␣gateprosopographicallyprosperity␣theologyprotopsychologicalprotopsychologistspseudoanaphylacticpseudoheritabilitypseudoheterozygouspseudohyperkalemiapseudohypertensionpseudohypertrophicpseudohyponatremiapseudomerohedrallypseudometallophytepseudometaphysicalpseudomythologicalpseudoparaphylliumpseudophylactocarppseudopolycythemiapseudopsychologiespseudopsychopathicpseudosynaesthesiapseudoxyrhophiinespsychic␣photographypsychoacousticallypsychoacousticianspsychoanalyticallypsychobiographicalpsychobiologicallypsychocivilizationpsychocosmologicalpsychodermatologicpsychodramaticallypsychogalvanometerpsychogalvanometrypsychogeographicalpsychogeriatricianpsychographologistpsychohistoricallypsycholinguisticalpsychological␣slipspsychologisticallypsychomanipulationpsychomanipulativepsychoneurologicalpsychoneurologistspsychoneuroticallypsychopathologicalpsychopathologistspsychopathologizedpsychopathologizespsychopharmaceuticpsychopharmacologypsychophilosophiespsychophoneticallypsychophysiologistpsychoprophylacticpsychosemanticallypsychosemioticallypsychosociologicalpsychosociologistspsychosomatizationpsychostimulationspsychotechnologiespsychotherapeuticspsychotherapeutistpsychotraumatologypsychrometric␣chartpsychrosensitivitypulmonary␣emphysemapunch␣drunk␣syndromepyranoanthocyaninspyrophosphokinasespyrophosphoramidespyrophosphoric␣acidpyrophosphorolysispyrophosphorolyticpyrophosphorylasespyrophosphorylatedpyrophosphorylysespyrophosphorylysispyrophosphorylyticPythagorean␣triplesrasterstereographyRaynaud's␣phenomenonRed␣Queen␣hypothesisrefreshable␣displayrenohistopathologyrephosphorylationsreticulated␣pythonsretinovasculopathyretrophylogenomicsrheoplethysmographrhinolaryngoscopesrides␣the␣cotton␣ponysaccopharyngiformssalpingopharyngealsalpingopharyngeussandplay␣therapistssapromycetophagousSaturday␣night␣palsyschool␣psychologistsecondary␣phosphineseismocardiographysemibiographicallyShaughnessy␣playoffshoving␣it␣up␣your␣asssigillographicallysignalling␣pathwayssling␣psychrometerssocial␣anthropologysocial␣psychologiessociopsychologicalsociopsychologistssodicanthophyllitesodium␣hypochlorite

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 1021 words
  • Spanish Wiktionary: no word
  • Italian Wiktionary: no word
  • German Wiktionary: 117 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 36 words

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