The word parallelism 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: 20
Highest Scoring Words With Friends™ Play In The Letters parallelism
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Seven Letter Word Alert: (24 words)
aerials, impalas, impaler, impales, lamella, lempira, mailers, malaise, millers, paellas, palmier, pillars, prelims, primase, prismal, rallies, realism, remails, sampler, simpler, smaller, spaller, spiller, spiraea