The word parallelisms 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
Seven Letter Word Alert: (53 words)
aerials, aimless, airless, airmass, aliases, armless, aspires, impalas, impaler, impales, impasse, impress, lamella, lempira, lipases, lipless, lispers, mailers, malaise, mapless, millers, paellas, palmier, palsies, paresis, pillars, plasmas, praises, prelims, premiss, primase, prismal, rallies, realism, remails, resails, rimless, sailers, salamis, sampler, samples, sarapes, serials, simpers, simpler, simples, smaller, smilers, spaller, spiller, spiraea, spirals, spireas