The word megaloblasts 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: 22
Highest Scoring Words With Friends™ Play In The Letters megaloblasts
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Seven Letter Word Alert: (34 words)
ablates, amoebas, atlases, bagless, ballast, ballets, ballots, balsams, basalts, gallate, gambles, gambols, gelatos, globals, globate, goblets, lambast, losable, mallets, maltose, massage, megabat, molests, oatmeal, salable, seabags, seamost, slaloms, stables, stalags, tamable, tamales, teabags, tollage