The word tricepses 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: 15
Highest Scoring Words With Friends™ Play In The Letters tricepses
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Seven Letter Word Alert: (30 words)
cerises, cesspit, cresset, persist, pesters, pierces, precise, presets, priests, receipt, recipes, recites, resects, respect, respice, respite, resteps, scepter, sceptre, scripts, secrets, septics, species, specter, spectre, spicers, spriest, sprites, stripes, triceps