The word strainers 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: 10
Highest Scoring Words With Friends™ Play In The Letters strainers
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Seven Letter Word Alert: (28 words)
antsier, arrests, artsier, errants, inserts, instars, nastier, raisers, ranters, rasters, restain, restirs, retains, retinas, retrain, rinsers, satires, seitans, sestina, sierras, sinters, snarers, stainer, starers, strains, tarries, terrain, trainer