The word protagonists 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: 18
Highest Scoring Words With Friends™ Play In The Letters protagonists
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Seven Letter Word Alert: (83 words)
agonist, artists, gastrin, grottos, instars, intorts, isogons, notator, notists, options, orating, oration, parings, parsing, parsons, parting, passing, passion, pasting, pastors, patriot, patrons, patting, pistons, poisons, porosis, porting, portion, posting, potions, potting, prating, prisons, protist, protons, rapists, rasping, ratings, rations, ratting, rattons, rattoon, risotto, rooting, rotting, signora, signors, soaping, soaring, sooting, soprano, sorting, sparing, spigots, sponsor, sporing, sporont, sprains, springs, sprints, sringas, staring, stating, statins, station, storing, strains, straint, straits, strings, taoists, tapings, taproot, tasting, tinpots, tooting, torsion, tossing, tosspot, transit, triptan, tropist, tsarist