The word multicellular 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: 25
Highest Scoring Words With Friends™ Play In The Letters multicellular
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Seven Letter Word Alert: (28 words)
aircell, allelic, alltime, article, auricle, calumet, claimer, climate, culture, cumular, cureall, curtail, literal, maltier, marlite, metical, micella, miracle, mullite, muriate, recital, reclaim, tallier, tramell, tumeric, ululate, uraemic, uralite