The word downstream 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™ Play In The Letters downstream
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Seven Letter Word Alert: (56 words)
anomers, artsmen, atoners, daemons, damners, deworms, donates, dormant, downers, enamors, endmost, madwort, maestro, martens, matrons, meadows, mentors, meronts, moaners, moderns, monster, mordant, mordent, oarsmen, onwards, radomes, randoms, remands, roadmen, roasted, rodents, seaworm, seaworn, senator, smarted, smarten, snorted, stander, stardom, steward, stormed, strawed, strowed, swarmed, tandems, tonearm, towards, treason, wanders, wanters, wardens, wardmen, warmest, woadmen, wonders, wordnet