The word stepbrothers 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: 20
Highest Scoring Words With Friends™ Plays In The Letters stepbrothers
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Seven Letter Word Alert: (62 words)
besorts, bespots, betroth, betters, bothers, brother, heptose, herbose, heteros, pesters, poetess, porters, posters, potherb, pothers, potters, presets, presort, presser, pretest, probers, protest, rebores, reports, reposer, reposes, reposts, repress, reprobe, reshoes, reshore, resorbs, resorps, resorts, respots, resteps, resters, restore, retests, retorts, rhetors, rosette, rosters, rotters, septets, setters, sherbet, shorter, soberer, sorbets, sorters, spheres, spotter, stereos, streets, strobes, strophe, tersest, testers, tethers, thereto, treetop