The word tonguefishes 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: 21
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (51 words)
egoists, ensuite, enthuse, feesing, fetuses, finesse, fishnet, fitness, fusions, fussing, genesis, genuses, gunshot, hefting, heinous, hessite, histone, hogties, hosting, hotness, housing, husting, igneous, infests, infuses, ingests, inhouse, nosiest, ousting, outfish, outings, outsees, seitens, sestine, shoeing, shoguns, shotgun, shutins, signees, signets, softens, softies, stenose, stogies, stonish, sunfish, thiones, tongues, tossing, toughen, toughie