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There are 945 eighteen-letter words containing H, L, P and Y

(page 6)

pseudophylactocarppseudopolycythemiapseudopsychologiespsychoacousticallypsychoanalyticallypsychobiographicalpsychobiologicallypsychocivilizationpsychocosmologicalpsychodermatologicpsychodramaticallypsychogalvanometerpsychogalvanometrypsychogeographicalpsychographologistpsychohistoricallypsycholinguisticalpsychological␣slipspsychologisticallypsychomanipulationpsychomanipulativepsychoneurologicalpsychoneurologistspsychoneuroticallypsychopathologicalpsychopathologistspsychopathologizedpsychopathologizespsychopharmacologypsychophilosophiespsychophoneticallypsychophysiologistpsychoprophylacticpsychosemanticallypsychosemioticallypsychosociologicalpsychosociologistspsychostimulationspsychotechnologiespsychotraumatologypterylographicallypulmonary␣emphysemapupillographicallypyelonephritogenicpyrheliometricallypyrophosphorolysispyrophosphorolyticpyrophosphorylasespyrophosphorylatedpyrophosphorylysespyrophosphorylysispyrophosphorylyticpyrrolidinophenonePythagorean␣triplesradiculomyelopathyradiculoneuropathyradiculoplexopathyradiometallographyreality␣pornographyrefreshable␣displayrenohistopathologyrepeated␣bodily␣harmrephosphorylationsreticulated␣pythonsretinohypothalamicretinovasculopathyretrophylogenomicsrheoplethysmographrhinolaryngoscopesright␣lymphatic␣ductsalpingopharyngealsalpingopharyngeussandplay␣therapistsSaturday␣night␣palsyschool␣psychologistsemibiographicallyShaughnessy␣playoffsigillographicallysignalling␣pathwayssling␣psychrometerssocial␣anthropologysocial␣psychologiessociopsychologicalsociopsychologistssodicanthophyllitesodium␣hypochloritesonosalpingographysouthern␣yellow␣pinespectrographicallyspectroheliographysphingoglycolipidsspinycheek␣sleepersspirocycloheptanessplanchnocraniallysplenohepatomegalyspondylarthritidesspondylarthropathyspondyloepiphysealspondylomyelopathyspondyloperipheralspondylotherapistsspotted␣flycatchersstaphylinidologiststaphylococcicidalSteeple␣with␣Tynehamsteganographicallystrontiopyrochloresubtherapeuticallysulphinic␣anhydridesulphonic␣anhydridesulphonylhydrazonesuperheavy␣elementssuperoleophobicitysuperphenomenalitysuperphysiologicalsupraphysiologicalsympatheticolyticssymplectomorphismssynapticulothecatesynchiotrophoblastsynctiotrophoblasttachistoscopicallytautomorphemicallyTaylor-White␣processtelautographicallytelecobaltotherapytelephone␣directorytetrahydropyrrolestetraphenylboratesthaumatopsyllioidstheoretical␣physicsthermokeratoplastythermophoreticallythermophysiologiesthiophosphorylatedthorn-apple␣crystalsthrombelastographythromboprophylaxesthromboprophylaxistitan␣primary␣schooltonsillopharyngealTouchard␣polynomialtoxicopharmacologytransphenomenalitytransphosphorylasetransphosphorylatetrialkylphosphinestrichlorobiphenylstrichlorodiphenylstricresyl␣phosphatetrimethylolpropanetrimethylphosphine

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 673 words
  • Spanish Wiktionary: 1 word
  • Italian Wiktionary: no word
  • German Wiktionary: 72 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 23 words

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