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There are 110 eighteen-letter words containing H, 2I and 4O

aminochronologicalanthropobiologicalanthropobiologistsbioanthropologicalbioanthropologistsbiochronologicallybiogeotechnologieschloroformizationschloroquinolinoneschoriogonadotropinchromosomatisationchromosomatizationchronobiologicallycoccolithophoridescontinuation␣schoolcosmophysiologicalcottonwood␣hibiscusdichloroindophenoldiiodohydroquinonedithiolopyrrolonesdolichomacrostomideosinophilopoiesiseosinophilopoieticepietiocholanoloneepipodophyllotoxinethnoornithologistfibrobronchoscopicharmonic␣proportionheterocoordinationhistomorphologicalHodge␣decompositionhollow␣body␣positionHollywoodificationhomopolymerisationhomopolymerizationichnomorphologicalimmunopathobiologylexicophonologicalmacroconidiophoresmicroiontophoresismicroiontophoreticmicromorphologicalmicroneighborhoodsmicroneighbourhoodmicrothromboembolimitochondriotoxinsmitochondriotropicmonochromatizationmonophthongisationmonophthongizationmorphohistologicalnomination␣boroughsnormophysiologicaloesophagostomiasisŌkuninushi-no-mikotooligochaetologistsopisthomonorchiineorganolithotrophicornithocheiromorphorthogonalisationsorthogonalizationsorthonormalisationorthonormalizationorthopneic␣positionOstrogothic␣Kingdomphosphocholinationphosphoisoprenoidsphospholipoproteinphosphonodithioatephosphorecognitionphosphoriboproteinphosphorodithioatephosphorothioationphotobiomodulationphotochlorinationsphotocycloadditionphotodecompositionphotodeteriorationphotodissociationsphotoincorporationphotoisomerisationphotoisomerizationphoto␣opportunitiesphotoperoxidationsphotophysiologicalphotorecombinationphytophototoxicityphytotoxicologicalpolydolopimorphianprothoracicotropicprotochlorophilideprotomitochondrialprotomitochondrionpsychosociologicalpsychosociologistsptilochronologicalradiochronologicalradiomorphologicalsalpingooophoritis salpingo-oophoritissociochronobiologysociophilosophicalsociopsychologicalsociopsychologistssociotechnologicalsolenofilomorphidsthrombocytopoiesisthrombocytopoietictoo␣much␣informationtoxicopathological

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 56 words
  • Spanish Wiktionary: 1 word
  • Italian Wiktionary: no word
  • German Wiktionary: 4 words
  • Portuguese Wiktionary: 3 words
  • Dutch Wiktionary: 1 word

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