The word polypeptides is playable in Words With Friends™, but 1 blank substituting for the letter 'p' is 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: 21
Highest Scoring Words With Friends™ Play In The Letters polypeptides
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Seven Letter Word Alert: (53 words)
deploys, deposit, despite, despoil, dipoles, distyle, dopiest, epidote, epipods, epipole, episode, epistle, epitope, eyelids, eyepits, eyeslit, eyespot, isotype, oilseed, pelites, peopled, peoples, peppily, peptide, peptise, pestled, petiole, piloted, plopped, poetise, popeyed, popeyes, poppies, posited, potpies, seedily, slipped, slopped, soliped, soppily, spoiled, steeply, stepped, stipple, stipply, stopped, styloid, tepidly, tippled, tipples, toppled, topples, topside