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There are 883 eighteen-letter words containing A, I, L, O, P and Y

(page 4)

nonphosphorylationnonphysiologicallynonpolysaccharidesnonproblematicallynonproportionalitynonproteolyticallynontopographicallynormophysiologicalnot␣Pygmalion␣likelynot␣while␣pussy's␣a␣catoctachlorobiphenyloligohymenophoreanoligohypomenorrheaoligoparaphenyleneOlympic␣Winter␣GamesOmphalos␣hypothesisonomatopoieticallyophthalmologicallyopportunity␣classesoptoelectronicallyorthotypographicaloscillographicallyosteocompatibilityotomicroscopicallyovercompensatinglyoveroptimisticallyoverproportionallyoversimplisticallyPaal-Knorr␣synthesisp-acetylaminophenolpachycephalosauridpachypleurosauridspaedopsychologicalpaedopsychologistsPaisley␣UndergroundpalaeobiochemistrypalaeobiodiversitypalaeobiogeographypalaeoclimaticallyPalaeodicotyledonspalaeoecologicallypalaeoepidemiologypalaeogeochemistrypalaeohydrographicpalaeohydrologicalpalaeohydrologistspalaeomagneticallypalaeomicrobiologypalaeoparasitologypalaeophycologicalpalaeoproductivitypalaeozygopleuridspaleoichthyologistpaleomyrmecologistpaleopalynologicalpaleopalynologistspaleophysiologicalpaleopsychologicalpalmitoylcarnitinepalynostratigraphypancreaticobiliarypapilioerythrinoneparaneoplasticallyparapodiapophysealparaprofessionallyparasympatholyticsparsimony␣principleparthenocarpicallypathenogeneticallypathophysiologicalpathophysiologistspathopsychologicalpatristic␣anthologypayload␣specialistspellitory␣of␣the␣wallpentaformylgitoxinperfluoroarylationpericonceptionallypericyclic␣reactionperiodic␣inequalityperitoneal␣dialysisperpetual␣inventorypersonality␣clashesphanerocrystallinephantasmagoricallypharmacophoricallypharmacophysiologypharmacotoxicologypharyngealizationspharyngobranchialspharyngoepiglotticpharyngointestinalpharyngolaryngitespharyngolaryngitispharyngotonsilitisphenomenologicallyphenylboronic␣acidsphenylbutanoic␣acidphenylcarbodiimidephenylchlorosilanephenyldiazomethanephenylethanolaminePhiladelphia␣CountyPhilippine␣mahoganyphosphatidylserinephosphoacetylationphosphoribosylatedphosphorylceramidephosphorylcreatinephotoallergenicityphotobiomodulatoryphotocatalyticallyphotocycloadditionphotodegradabilityphotophysiologicalphotopolymerizablephotoswitchabilityphotosyntheticallyphototypographicalphylobetadiversityphylostratigraphicphylotranscriptomephysical␣geographerphysicochemicalismphysicotheologicalphysiogeographicalphysiopathologicalphysiopathologistsphytohemagglutininphytohemaglutininephytomorphologicalphytopharmacologicphytophysiologicalphytoplanktivorousphytostabilisationphytostabilizationphytotherapeuticalphytotopographicalphytotoxicologicalpicocyanobacterialpink␣fairy␣armadillopiss␣money␣up␣the␣wallPittsylvania␣Countyplastohydroquinoneplaying␣Nostradamusplay␣one's␣cards␣rightplays␣one's␣hand␣rightplay␣well␣with␣othersplay␣with␣edged␣toolsplay␣with␣house␣money

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 476 words
  • Spanish Wiktionary: no word
  • Italian Wiktionary: no word
  • German Wiktionary: 28 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 18 words

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