The word melanocytes 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 melanocytes
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Seven Letter Word Alert: (53 words)
acetone, acetyls, acolyte, alecost, amnesty, amylene, calmest, cantles, cements, cenotes, cleanse, clement, cleomes, coalmen, cotylae, cotyles, cyanose, cystoma, cytomas, enamels, encalms, enclose, enocyte, enolase, enolate, enstyle, etymons, lactone, lactose, laments, lancets, lateens, latency, leanest, leantos, locates, maltose, mantels, mantles, meanest, menaces, motleys, mycetal, neocyte, octanes, octenes, octynes, oleates, omelets, scalene, scantly, telecom, tensely