The word decomposable 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: 26
Highest Scoring Words With Friends™ Plays In The Letters
Seven Letter Word Alert: (44 words)
albedos, becomes, bedlamp, bedlams, beldame, beldams, bemedal, bloomed, boodles, bosomed, caboose, clamped, clasped, cleomes, clomped, coeloms, comedos, compels, compose, debacle, decamps, deposal, descale, elapsed, elodeas, embased, emplace, escaped, ooplasm, opcodes, placebo, placode, pleased, pomades, pomelos, poodles, psalmed, sampled, scalped, scamped, scooped, sepaled, solaced, spooled