The word overstrain 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: 15
Highest Scoring Words With Friends™ Plays In The Letters overstrain
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Seven Letter Word Alert: (49 words)
antsier, arrives, artsier, atoners, errants, evasion, inverts, ironers, naivest, nastier, natives, norites, orients, ornater, otarine, ovaries, overran, oversat, oversit, ranters, rations, ravines, reroast, restain, retains, retinas, retrain, rioters, roaster, roister, savorer, senator, serovar, servant, snorter, stainer, starver, stonier, striven, striver, tarries, taverns, terrain, trainer, treason, triones, vainest, veritas, version