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There are 399 eighteen-letter words containing 2H, 2O and Y

(page 3)

polyhydroxyphenolspolyphosphoric␣acidpolyphosphorylatedpolyphthalocyaninepolyplethysmographprephosphorylatingprephosphorylationprotoanthophyllitepseudohypertrophicpseudopsychopathicpseudoxyrhophiinespsychic␣photographypsychobiographicalpsychogeographicalpsychographologistpsychohistoricallypsychopathologicalpsychopathologistspsychopathologizedpsychopathologizespsychopharmacologypsychophilosophiespsychophoneticallypsychophysiologistpsychoprophylacticpsychotechnologiespyrophosphokinasespyrophosphoramidespyrophosphoric␣acidpyrophosphorolysispyrophosphorolyticpyrophosphorylasespyrophosphorylatedpyrophosphorylysespyrophosphorylysispyrophosphorylyticPythagorean␣theoremQuiyoughcohannocksrenohistopathologyrephosphorylationsretinohypothalamicrheoplethysmographschool␣psychologistsecondary␣phosphinesodicanthophyllitesodium␣hypochloritesouth-southeasterlysouth-southwesterlyspectroheliographyspectrophotographyspondylarthropathysulphonylhydrazonesympathochromaffinsympathoinhibitionsympathoinhibitorssympathoinhibitorysymphony␣orchestrassynchiotrophoblasttetrahydrochloridetheory␣of␣everythingthermohydrodynamicthermomechanometrythermophoreticallythermophysiologiesthermoradiotherapythiocarbohydrazidethiophosphorylatedthiopyrophosphatesthough␣I␣say␣so␣myselfthrombelastographythrombocytopathiesthromboprophylaxesthromboprophylaxisthru-hole␣technologythyrohyoid␣membranethyrotropic␣hormonetransphosphorylasetransphosphorylatetrash␣heap␣of␣historytrichlorobiphenylstrichlorodiphenylstrichloroethylenestriphosphorylationunorthographicallyunphosphorylatablewave␣the␣bloody␣shirtwhat␣time␣have␣you␣gotwho's␣a␣pretty␣boy␣thenyellow-billed␣choughyellow␣light␣of␣deathyeoman␣of␣the␣chamberyeomen␣of␣the␣chamberyou␣know␣what␣they␣sayzosterophyllophyte

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 164 words
  • Spanish Wiktionary: no word
  • Italian Wiktionary: no word
  • German Wiktionary: 18 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 3 words

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