The word bacteriostat 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: 18
Highest Scoring Words With Friends™ Plays In The Letters bacteriostat
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Seven Letter Word Alert: (72 words)
abaters, abators, abettor, abreact, abreast, acaters, acrobat, aerobic, airbase, airboat, arabise, artiest, ascribe, atresia, attires, attract, attrist, attrite, baiters, barista, barites, batters, battier, biotest, bitrate, bitters, boaster, boaters, borates, cabaret, catboat, cattier, citator, citrate, coaster, costate, cotters, cristae, erotica, erotics, iceboat, iratest, raciest, ratbite, rebaits, reboast, recoats, retoast, ricotta, rosacea, rotates, satiate, scatter, scoriae, sorbate, sorbite, statice, striate, strobic, tabasco, tartest, tastier, tatters, tattier, teacart, terabit, titrate, titters, toaster, totters, tricots, trisect