The word menstrual 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 menstrual
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Seven Letter Word Alert: (35 words)
amulets, antlers, armlets, artsmen, eluants, emulant, estrual, laments, lunates, mantels, mantles, manures, martens, matures, maulers, mensual, natures, neutral, numeral, nutmeal, rentals, reslant, saltern, saluter, saunter, serumal, smarten, sternal, sternum, surname, tramels, unalert, unalter, unmates, unsmelt