The word stepmothers 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 stepmothers
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Seven Letter Word Alert: (45 words)
emoters, empress, heptose, heteros, meshers, meteors, mothers, pesters, poetess, posters, pothers, potters, presets, pretest, protest, rehomes, remotes, reposes, reposts, reshoes, respots, restems, resteps, retests, rosette, septets, setters, smother, spheres, spotter, stereos, stomper, streets, strophe, tempers, tempest, tempore, tempter, tersest, testers, tethers, theorem, thereto, thermos, treetop