The word fortitudes 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: 15
Highest Scoring Words With Friends™ Play In The Letters fortitudes
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Seven Letter Word Alert: (38 words)
defrost, detorts, detours, distort, dittoes, dotiest, dotters, dottier, dustier, editors, fitters, foisted, foister, forties, frosted, fruited, ioduret, outfire, outfits, outride, outside, roisted, rudites, sortied, steroid, storied, stourie, stouter, studier, surfeit, tedious, tierods, tourist, touters, trusted, tufters, tuftier, tutored