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List of 15-letter words containing

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There are 7 fifteen-letter words containing E, 2F, 2I, O and 2S

EFFICACIOUSNESSefficaciousness n. Quality of being efficacious.
EFFICACIOUS n. having the power to produce a desired effect.
FORISFAMILIATESforisfamiliates v. Third-person singular simple present indicative form of forisfamiliate.
FORISFAMILIATE v. (Scots) to emancipate from parental authority.
INOFFENSIVENESSinoffensiveness n. The state or condition of being inoffensive.
INOFFENSIVE n. causing no harm or injury, also UNOFFENSIVE.
INOFFICIOUSNESSinofficiousness n. The quality of being inofficious.
INOFFICIOUS n. not officious.
INTERDIFFUSIONSinterdiffusions n. Plural of interdiffusion.
INTERDIFFUSION n. the process of diffusing and mixing freely so as to approach a homogeneous mixture.
OFFICIOUSNESSESofficiousnesses n. Plural of officiousness.
OFFICIOUSNESS n. OFFICIOUS, volunteering one's services too eagerly.
UNFOSSILIFEROUSunfossiliferous adj. Not fossiliferous, nonfossiliferous.
UNFOSSILIFEROUS adj. not fossiliferous.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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See this list for:

  • English Wiktionary: 33 words
  • Scrabble in French: 28 words
  • Scrabble in Spanish: 10 words
  • Scrabble in Italian: 34 words
  • Scrabble in German: no word
  • Scrabble in Romanian: no word


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