The word nonproprietary 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: 24
Highest Scoring Words With Friends™ Play In The Letters nonproprietary
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Seven Letter Word Alert: (46 words)
airport, annoyer, appoint, entrain, entropy, intoner, nonriot, operant, oration, oratory, ornater, otarine, painter, partner, pertain, pinnate, pointer, pontine, portion, portray, praetor, printer, pronate, propane, propine, propyne, prorate, protean, protein, rapport, reannoy, repaint, repoint, reprint, retrain, tannery, tarrier, ternary, terrain, terroir, topiary, toprope, trainer, trapper, tripper, trooper