The word watercresses 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: 18
Highest Scoring Words With Friends™ Plays In The Letters watercresses
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Seven Letter Word Alert: (51 words)
actress, arrests, asserts, careers, carters, casters, caterer, cerates, crasser, craters, creaser, creases, creates, cresses, cresset, erasers, erecter, rasters, recasts, recrate, reerect, reseats, resects, resters, reswear, retears, retrace, retrees, rewater, scarers, screwer, seaters, secrete, secrets, seesaws, serrate, starers, steerer, swearer, sweater, sweeter, tearers, teasers, terrace, tracers, tresses, wasters, waterer, wearers, wrasses, wrester