The word overvaliant 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 overvaliant
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Seven Letter Word Alert: (28 words)
aeolian, aileron, aviator, avivore, elation, involve, latrine, otarine, ovarian, overlit, ratline, reavail, reliant, retinal, retinol, revival, toenail, travail, trenail, valiant, variant, variate, variola, velaria, ventral, violate, violent, volvent