The word stepparent 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: 17
Highest Scoring Words With Friends™ Plays In The Letters stepparent
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Seven Letter Word Alert: (36 words)
earnest, eastern, entraps, entreat, nappers, natters, nearest, neatest, netters, panters, parents, patents, pattern, patters, petnaps, present, pretans, pretape, pretest, repaste, repeats, repents, restate, retapes, retaste, septate, serpent, snapper, spatter, stepper, sterane, tappers, tapster, tenters, ternate, trepans