The word chimneystack 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: 30
Highest Scoring Words With Friends™ Plays In The Letters chimneystack
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Seven Letter Word Alert: (60 words)
accents, accites, achiest, aitches, amenity, amnesic, amnesty, anthems, anytime, ascetic, atheism, cachets, cakiest, catches, catkins, chances, chantey, chasten, chemics, chemist, chicken, chimney, chymase, chymics, chymist, cinches, cinemas, cyanise, cyanite, cystine, ecthyma, emacity, ethnics, hackney, haemins, hankies, hickeys, hymnist, icemans, inmates, intakes, kitchen, kyanise, kyanite, machine, matches, mickeys, mistake, nematic, nickase, schtick, scythic, shitake, sketchy, snatchy, snitchy, stenchy, thicken, thymine, yachtie