The word wheatgrasses 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: 19
Highest Scoring Words With Friends™ Plays In The Letters wheatgrasses
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Seven Letter Word Alert: (43 words)
aerates, assarts, asserts, eartags, gashers, gassers, gathers, gearset, grasses, greases, hearses, heaters, hetaera, rashest, reheats, reseats, restage, rethaws, searats, seastar, seaters, seesaws, stagers, stashes, swasher, swashes, swathes, sweater, teargas, teasers, teaware, trashes, tresses, washers, washrag, wastage, wasters, weather, whereas, whereat, wrasses, wreathe, wreaths