The word stepfathers 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 stepfathers
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Seven Letter Word Alert: (61 words)
asperse, estates, fastest, fathers, feather, festers, fetters, hafters, hapters, hatters, heapers, hearses, heaters, hefters, pasters, patters, pesters, phrases, preheat, presets, pretest, rashest, reheaps, reheats, repaste, repasts, repeats, reseats, reshape, restate, resteps, retapes, retaste, retests, seaters, septate, septets, serapes, seraphs, setfast, setters, shapers, shatter, sherpas, sparest, spatter, spheres, staters, streets, tapster, tasters, teasers, tephras, tersest, testers, tethers, theater, theatre, thereat, threats, trashes