The word melanoblasts 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 melanoblasts
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Seven Letter Word Alert: (49 words)
abalone, ablates, absents, amoebas, atlases, ballast, ballets, ballots, balsams, basalts, baseman, batsman, batsmen, bellman, bemoans, benmost, bestman, boatman, boatmen, entombs, lambast, laments, leantos, losable, mallets, maltose, manless, mantels, mantles, molests, nabales, netball, noblest, notable, oatmeal, salable, salmons, sealant, seamost, slaloms, sonatas, stables, stamens, stanols, stollen, tamable, tamales, tollman, tollmen