The word shapeliest 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: 16
Highest Scoring Words With Friends™ Play In The Letters shapeliest
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Seven Letter Word Alert: (30 words)
aplites, ashiest, atheise, easiest, elapses, epistle, halites, hapless, haplite, hatless, heeltap, hessite, leashes, lipases, palsies, pastels, pasties, pelites, pestles, petless, pieless, pilates, pitless, plashes, pleases, staples, tealess, teasels, tieless, tipless