The word steamfitter 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: 17
Highest Scoring Words With Friends™ Plays In The Letters steamfitter
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Seven Letter Word Alert: (47 words)
aeriest, artiest, attires, attrist, attrite, emirate, emitter, faeries, fairest, fattest, fattier, fatties, fetters, firmest, fitters, fittest, freesia, iratest, itemset, iterate, matters, meatier, metrise, metrist, reemits, remates, restate, retaste, reteams, retimes, seamier, seriate, seriema, smartie, smatter, steamer, striate, tartest, tastier, tatters, tattier, teatime, termite, testate, testier, titrate, titters