The word muttonfishes is playable in Words With Friends™, no blanks required. Because it is longer than 7 letters, you would have to play off an existing word or do it in several moves.
Words With Friends™ Letter Score: 22
Highest Scoring Words With Friends™ Plays In The Letters muttonfishes
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Seven Letter Word Alert: (45 words)
fishnet, fitness, foments, fumiest, fusions, heinous, histone, homiest, hotness, humites, infests, infuses, inhouse, isthmus, minuets, minuses, minutes, mistune, mitoses, mittens, moisten, mountie, munites, nosiest, notists, outfish, outfits, outsets, outsits, shutins, smitten, softens, softest, softies, somites, stetson, stomies, stonish, sunfish, teutons, theisms, theists, thiones, timeout, utmosts