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 There are 4 twelve-letter words containing F, N, 3O and U| COUNTERPROOF | • counterproof n. (Printing) The inverted image of an original proof. • counterproof n. (Logic) A proof that contradicts a given statement.
 • COUNTERPROOF n. an inverted impression obtained from a newly printed proof of an engraving, by laying it, while the ink is still wet, upon plain paper, and passing it through the press.
 |  | FLUOROCARBON | • fluorocarbon n. (Chemistry) Any derivative of a hydrocarbon in which every hydrogen atom has been replaced by fluorine. • FLUOROCARBON n. any of a series of compounds of fluorine and carbon.
 |  | NONFRIVOLOUS | • nonfrivolous adj. (Law) Not frivolous. • NONFRIVOLOUS adj. not frivolous.
 |  | SOUNDPROOFED | • soundproofed v. Simple past tense and past participle of soundproof. • SOUNDPROOF v. to insulate so as to obstruct the passage of sound.
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 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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