The word rudderposts 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™ Play In The Letters rudderposts
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Seven Letter Word Alert: (50 words)
deports, despots, detours, dousers, dressup, dusters, estrous, oestrus, ousters, outsped, porters, poseurs, posters, posture, pourers, pouters, presort, prodder, prouder, pursers, reports, reposts, repours, resorps, resorts, respots, retours, rodders, rosters, routers, rudders, sorters, sourest, sported, spoused, spouted, spouter, sprouts, spurred, spurted, spurter, stupers, stupors, toruses, tourers, trouped, trouper, troupes, trouser, trussed