The word overstrains 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: 16
Highest Scoring Words With Friends™ Plays In The Letters overstrains
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Seven Letter Word Alert: (83 words)
antsier, arrests, arrives, artsier, atoners, errants, evasion, inserts, instars, inverts, invests, ironers, naivest, nastier, natives, norites, nosiest, orients, ornater, otarine, ovaries, overran, oversat, oversit, raisers, ranters, rasters, rations, ravines, reasons, reroast, resorts, restain, restirs, retains, retinas, retrain, rinsers, rioters, roaster, roister, rosiest, rosters, satires, saviors, savorer, seitans, senator, seniors, serovar, servant, sestina, sierras, sinters, snarers, snorers, snorter, soarers, sorters, sorties, stainer, starers, starver, starves, stivers, stoners, stonier, stories, strains, striven, striver, strives, tarries, taverns, tensors, terrain, trainer, treason, triones, vainest, verists, veritas, version