The word protagonism 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™ Play In The Letters protagonism
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Seven Letter Word Alert: (64 words)
agonism, agonist, amongst, armpits, gastrin, gnomist, imparts, impasto, imports, isogram, margins, maroons, martins, matings, matrons, migrant, moating, monitor, mooring, moorpan, mooting, motions, options, orating, oration, parings, parsing, parting, pasting, patrons, poromas, porting, portion, posting, postman, potions, prating, primost, prosoma, protons, rasping, ratings, rations, roaming, romping, rooming, rooting, signora, soaping, soaring, sooting, soprano, sorting, sparing, sporing, sporont, staring, storing, tamping, tampons, tapings, taproom, toprims, torsion