The word pelycosaurs 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: 21
Highest Scoring Words With Friends™ Play In The Letters pelycosaurs
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Seven Letter Word Alert: (88 words)
acerous, acouple, alecups, arouses, calypso, capless, capsule, carless, carouse, carpels, causers, clasper, clauses, closers, closeup, closure, cloyers, coalers, corpses, coupler, couples, courses, crassly, cresols, crossly, cupless, cupolas, cypress, cypsela, elusory, escarps, escolar, lassoer, leprosy, leprous, oarless, oculars, oracles, oscular, ospreys, parcels, parleys, paroles, parsecs, parsley, percuss, perusal, pessary, placers, players, poseurs, prelacy, process, pulsars, pulsers, pylorus, rayless, reclasp, reclass, recoals, recoups, recusal, replays, saucers, scalers, scalper, scapose, scleras, scrapes, scruple, secular, slayers, slopers, soapers, solacer, solaces, sources, spacers, sparely, specula, splayer, sporule, spousal, spruces, sucrase, sucrose, upscale, yaupers