The word fratricides 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: 18
Highest Scoring Words With Friends™ Play In The Letters fratricides
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Seven Letter Word Alert: (62 words)
airiest, airside, aridest, artsier, astride, carders, carried, carries, carters, crafted, crafter, craters, credits, cristae, dacites, dairies, darters, deficit, deistic, diaries, diarist, diciest, dietics, directs, dirtier, dirties, disrate, ditsier, drafter, drastic, drifter, erratic, fairest, fairies, fraters, irisate, raciest, radices, rafters, raiders, recraft, redacts, redraft, refract, retards, satiric, scarfed, scarier, scarred, sidecar, starred, stirred, strider, tardier, tarried, tarries, tidiers, tirades, tracers, traders, triadic, trifids