The word damselfishes 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
Seven Letter Word Alert: (50 words)
aediles, aidless, aimless, ashless, damsels, deashes, defames, defiles, defleas, deflesh, delimes, demises, deslime, diesels, disease, dismals, emailed, females, flashed, flashes, fleshed, fleshes, halides, hassles, himself, hisself, lassies, leashed, leashes, limeade, measles, messiah, misdeal, misfeed, mislead, missals, sadisms, sealife, seaside, selfies, selfish, sesames, sessile, sheafed, shields, siamese, slashed, slashes, smashed, smashes