The word windbreaker 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: 23
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (35 words)
barreed, bawdier, beadier, bendier, berried, braider, brained, brander, branked, breaker, breakin, dernier, drainer, drinker, inbreed, knarred, kneader, nerdier, rabider, randier, readier, rebaked, rebraid, rebrand, redrawn, reinked, rewired, wakened, wakener, wearied, wearier, webinar, weirder, widener, wreaked