The word menstruate 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™ Play In The Letters menstruate
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Seven Letter Word Alert: (54 words)
artsmen, astuter, attunes, austere, earnest, eastern, entreat, entrust, estuate, euaster, manures, martens, matters, matures, meanest, measure, mutants, mutates, mutters, natters, natures, nearest, neatest, netters, neuters, nutmeat, nutters, remates, renames, restate, retaste, reteams, retunes, saunter, smarten, smatter, stature, steamer, sterane, sternum, stratum, stunter, surname, tantrum, taunter, tautens, tenters, tenures, ternate, tetanus, truants, trustee, unmates, unreset