The word downstrokes 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: 20
Highest Scoring Words With Friends™ Play In The Letters downstrokes
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Seven Letter Word Alert: (29 words)
downers, dowress, dowsers, dowsets, drowses, knowers, network, noosers, nosodes, osteons, reknots, rodents, roosted, snooker, snooted, snorted, sooners, soonest, stokers, stoners, stroked, strokes, strowed, swooned, swooner, tensors, wonders, wordnet, worsens