The word pelycosaur 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: 20
Highest Scoring Words With Friends™ Play In The Letters pelycosaur
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Seven Letter Word Alert: (47 words)
acerous, acouple, alecups, calypso, capsule, carouse, carpels, clasper, closeup, closure, cloyers, coalers, coupler, couples, cupolas, cypsela, elusory, escolar, leprosy, leprous, oculars, oracles, oscular, parcels, parleys, paroles, parsley, perusal, placers, players, prelacy, pylorus, reclasp, recoals, recoups, recusal, replays, scalper, scruple, secular, solacer, sparely, specula, splayer, sporule, upscale, yaupers