The word proselytize 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: 26
Highest Scoring Words With Friends™ Play In The Letters proselytize
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Seven Letter Word Alert: (52 words)
elopers, epistle, erotise, erotize, estriol, eyepits, eyeslit, eyespot, isotype, leprosy, loiters, pelites, pelters, perlite, petiole, petrels, petrols, poetise, poetize, politer, pretzel, pyrites, repiles, repilot, replies, replots, reptile, respelt, respite, resplit, restyle, retiles, retypes, ropiest, roselet, seltzer, spoiler, steeply, sterile, stripey, stylier, stylize, tersely, toilers, triples, tripole, yelpers, yperite, zeolite, zeroise, zestier, zestily