The word periphrasis 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: 19
Highest Scoring Words With Friends™ Play In The Letters periphrasis
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Seven Letter Word Alert: (43 words)
airpipe, airship, apprise, aspirer, aspires, hairier, happier, harpers, harpies, hippies, hissier, paresis, parsers, perhaps, phraser, phrases, pissier, prairie, praiser, praises, raisers, rappers, rashers, raspers, raspier, raspish, repairs, reships, rippers, sappers, sappier, seraphs, shapers, sharers, sharper, sharpie, sherpas, shipper, sierras, sippers, sparers, sparser, spireas