The word fishplates 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: 19
Highest Scoring Words With Friends™ Plays In The Letters fishplates
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Seven Letter Word Alert: (22 words)
aplites, ashiest, falsest, fiestas, flashes, fleapit, halites, hapless, haplite, hatless, hisself, lipases, palsies, pastels, pasties, pilates, pitless, plashes, selfish, staples, stifles, tipless