The word conventionalize 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: 35
Highest Scoring Words With Friends™ Play In The Letters conventionalize
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Seven Letter Word Alert: (64 words)
acetone, aconite, aloetic, ancient, aniline, anionic, antlion, avionic, cannoli, cannolo, canteen, catenin, ciliate, citizen, coalite, coalize, connive, connote, contain, convene, convent, coolant, ecozone, elation, elative, enclave, enliven, enolate, enolize, evocate, iconize, ilvaite, incline, invitee, invoice, lactone, laicize, lection, lenient, lineate, lionize, neonate, noncola, nonevil, nonlate, nonlove, olivine, oolitic, ovation, ozonate, toenail, valence, veinlet, vinelet, violate, violent, volcano, voltaic, zeolite, zincate, zincite, zoecial, zooecia, zoolite