The word bacteroids 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 bacteroids
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Seven Letter Word Alert: (71 words)
abiders, aborted, aerobic, airbeds, aridest, ascribe, astride, astroid, baiters, barcode, barites, batoids, bedirts, bestrid, boasted, boaster, boaters, bodices, borates, bracted, braised, brocade, carbide, carotid, catbird, ceroids, coasted, coaster, coedits, cordate, credits, cristae, dacites, debtors, decabit, decarbs, deorbit, directs, disrate, disrobe, drastic, editors, erotica, erotics, iceboat, orbited, raciest, radices, rebaits, reboast, recoats, redacts, roadies, roasted, roisted, sarcode, scabrid, scoriae, scribed, seabird, sidebar, sidecar, sorbate, sorbite, sortied, steroid, storied, strobed, strobic, tierods, tirades