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There are 741 eighteen-letter words containing E, 2O, P, R and Y

(page 5)

pyrophosphoramidespyrophosphorylasespyrophosphorylatedpyrophosphorylysespyrrolidinophenonePythagorean␣theoremquaternary␣compoundradiation␣pyrometerradiculomyelopathyradiculoneuropathyradiculoplexopathyradioimmunotherapyradiometallographyradiometeorographyRaynaud's␣phenomenonreality␣pornographyrectosigmoidoscopyrenohistopathologyrephosphorylationsreticulocytopeniasretinohypothalamicretinovasculopathyretrophylogenomicsrheoplethysmographrhinolaryngoscopesrides␣the␣cotton␣ponyrobs␣Peter␣to␣pay␣PaulRoyal␣Leamington␣SpasalpingovariectomySanfilippo␣syndromesapromycetophagousscansoriopterygidssecondary␣phosphinesecondary␣predationseismocardiographysemiprofessionallysialoglycopolymerssialoglycoproteasesialoglycoproteinssialoglycoproteomesialylglycopolymersialylglycoproteinsodium␣hypochloritesoftware␣deploymentsouthern␣yellow␣pinespectrocolorimetryspectrofluorimetryspectrofluorometryspectroheliographyspectromorphometryspectrophotographyspectropolarimetryspherostomatocytesspirocycloheptanesspirocyclopentanesspirocyclopropanesspondyloperipheralspondylotherapistsstephanoberyciformstereotypographersstorage␣hypervisorsstrontiopyrochloresubtropical␣cyclonesuccinylproteomicssuffer␣by␣comparisonsulphonylhydrazonesuperiority␣complexsuperoleophobicitysuperphysiologicalsuperpositionalitysuperstoichiometrysuspension␣syndromesymbolic␣expressionsympathoexcitatorysymphony␣orchestrassymplectomorphismssynaptodendrosomalsynaptodendrosomessynaptosoneurosometautomorphemicallyTaylor-White␣processtelecobaltotherapytelephone␣directorytemporozygomaticaltensores␣tympanorumtetrahydropyrrolestetranary␣compoundsthermokeratoplastythermophoreticallythermophysiologiesthermoradiotherapythermoresponsivitythiophosphorylatedthiopyrophosphatesthrombelastographythrombocytopaeniasthrombocytopathiesthrombocytopoiesisthrombocytopoieticthromboprophylaxesthyrotropic␣hormonetonsillopharyngealtransphosphorylasetransphosphorylatetranspolyisoprenestrash␣heap␣of␣historytriazolopyrimidinetrichlorobiphenylstrichlorodiphenylstriisopropylsilanetrimethylolpropanetryptophylquinonestype␣introspectionstypographical␣errorundecylprodigiosinunphosphorylatableup␣the␣country␣peopleureterocystoplastyureterolithotripsyureteronephrectomyureteropyelographyureteropyeloscopicurethrocystoscopicvectorcardiographyvelocity␣dispersionvelopharyngoplastyvideolaryngoscopes video␣laryngoscopesvideolaryngoscopicvinylcyclopropaneswho's␣a␣pretty␣boy␣thenwukipolyomavirusesxylopolysaccharideYour␣Worshipfulnesszosterophyllaceouszosterophyllophytezygomaticotemporalzygomatic␣processes

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 455 words
  • Spanish Wiktionary: 1 word
  • Italian Wiktionary: no word
  • German Wiktionary: 29 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 26 words

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