The word comfortless 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 comfortless
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Seven Letter Word Alert: (29 words)
closers, closest, closets, coeloms, colters, comfort, coolers, coolest, corsets, creosol, cresols, escorts, florets, footers, forests, fosters, frescos, loosest, looters, molests, morsels, ocelots, ostlers, retools, scooter, sectors, sterols, toolers, tremolo