The word proliferation 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: 21
Highest Scoring Words With Friends™ Play In The Letters proliferation
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Seven Letter Word Alert: (95 words)
aileron, airfoil, airlift, airline, airport, elation, fainter, filiate, fireant, firelit, firepan, firepit, firepot, fleapit, flirter, floater, foliate, forlorn, frailer, frontal, inertia, inflate, latrine, lintier, liriope, loftier, loonier, loopier, nepotal, niftier, oilfire, opaline, operant, oration, ornater, otarine, painter, partner, pentail, pertain, pinfire, pinitol, pintail, plainer, planter, platoon, pointer, polaron, politer, poofier, portion, praetor, prairie, praline, printer, profane, profile, proline, pronate, proofer, prorate, protean, protein, rainier, ratline, realtor, refloat, refrain, reliant, repaint, repilot, replait, replant, repoint, reprint, reproof, retinal, retinol, retrain, retrial, roilier, tailfin, tailpin, terrain, tinfoil, toenail, topline, toprail, trailer, trainer, trefoil, trenail, trifler, tripole, trooper