The word proletarian 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: 16
Highest Scoring Words With Friends™ Play In The Letters proletarian
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Seven Letter Word Alert: (57 words)
aeolian, aerator, aileron, airport, apteria, areolar, atropia, elation, latrine, narrate, nepotal, opaline, operant, ornater, otarine, painter, partial, partner, patinae, patrial, pentail, pertain, plainer, planeta, plantar, planter, pointer, politer, praetor, praline, printer, proline, pronate, prorate, protean, protein, ratline, realtor, reliant, repaint, repilot, replait, replant, repoint, reprint, retinal, retinol, retrain, retrial, terrain, toenail, topline, toprail, trailer, trainer, trenail, tripole