The word sphincters 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™ Play In The Letters sphincters
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Seven Letter Word Alert: (46 words)
cesspit, chipset, ciphers, cistern, cithern, cithers, cretins, crispen, ethnics, hipness, incests, inchers, insects, inserts, inspect, insteps, pectins, persist, phrenic, pincers, pincher, pinches, pitcher, pitches, priests, princes, pterins, repitch, reships, respins, richest, scripts, septics, shiners, shrines, sinters, snipers, sphenic, spheric, spicers, spinets, spriest, sprints, sprites, stripes, triceps