The word centrosomes 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™ Plays In The Letters centrosomes
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Seven Letter Word Alert: (43 words)
cements, cenotes, censers, censors, centers, centres, consort, cornets, coronet, corsets, cresset, emoters, encores, escorts, estrone, mentors, meronts, meteors, monster, necrose, nesters, noosers, octenes, osteons, remotes, renests, resects, resents, restems, scenter, scooter, screens, secerns, secrets, sectors, sermons, someone, sooners, soonest, stenose, stereos, stoners, tensors