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There are 703 eighteen-letter words containing A, I, N, 3O and S

(page 4)

occipitosphenoidaloctadehydrocorrinsoesophagobronchialoligodendrocytomasoligodendrogliomasoligodendropathiesoligoendopeptidaseoligonucleotidasesoligoribonucleaseson␣a␣collision␣courseon␣a␣need-to-know␣basison␣trial␣for␣one's␣lifeopening␣Pandora's␣boxoperationalisationopposition␣researchopsonophagocytosisopsonophagocytoticOrder␣of␣Friars␣Minororders␣of␣operationsordinary␣resolutionorganoboronic␣acidsorgans␣of␣generationOriental␣Orthodoxesornithogeographersornithomimosaurianorthogonalisationsorthogonalizationsorthonormalisationosseocartilaginousosseodensificationosteoblastogenesisosteocalcificationosteocartilagenousosteocartilaginousosteochondropathiaosteoclastogenesisosteoclastogeneticosteoimmunologicalosteoproliferationosteoradionecrosisosteoradionecroticoutwardlookingness outward-lookingnessoverapproximations over-approximationsoverextrapolationsoverglorificationsoversophisticationoviraptorosauriansowners␣corporationsoxazaphospholidineoxazolidinethionespachyrhizodontoidsPalaeodicotyledonspalaeoentomologistpalaeoethnologistspalaeolimnologistspalaeoneurologistspalaeornithologistpaleoentomologistspaleoethnobotanistpaleopalynologistspaleornithologistspalinactinodromousparadoxes␣of␣fictionpathomorphogenesispentachloroanisolepericombobulationsPermocarboniferous Permo-Carboniferousphallologocentrismpharmacoeconomistsphonomicrosurgicalphosphoacetylationphosphocholinationphosphoglucokinasephosphoglucosaminephospholipomannansphosphonodiamiditephosphonodithioatephosphonopentanoicphosphorocyanidatephosphorothioationphotoassimilationsphotochlorinationsphotoconceptualismphotoconceptualistphotocrosslinkablephotodissociationsphotodocumentariesphotoencapsulationphotofermentationsphotoinactivationsphotoisomerisationphotoisomerizationphotoperoxidationsphotoperturbationsphotoregenerationsphotosensitisationphotosensitizationphotostabilizationphotosterilizationphytoplanktivorouspicornavirologistspin␣a␣rose␣on␣your␣nosepissed␣out␣of␣one's␣asspisses␣out␣of␣one's␣assplastohydroquinonePoland␣Is␣Not␣Yet␣Lostpolitical␣economiespolitical␣economistpolygamomonoeciouspolyphenoloxidasespolysomnographicalpolysomnographistspolysporangiophytepoor␣is␣a␣state␣of␣mindpositional␣notationpositive␣lookaroundpostbronchodilatorpostconceptionallypostconstitutionalpost-creole␣continuapostdepositationalpostdepositionallyposterodorsomedianpostfoundationallypostorbitofrontalspostpolymerizationpostrepolarizationpour␣honey␣in␣one's␣earprecompositionallyprephosphorylationpreposition␣of␣placepreprosomatostatinproapolipoproteinsprofessional␣sportsprognostificationsprolonged␣abortionspronominalizationsproofs␣by␣exhaustionpropionylpromasineproportionablenesspropositional␣logicproposition␣nationsproposition␣playersproteoaminoglycans

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