The word overvaluation 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: 24
Highest Scoring Words With Friends™ Play In The Letters overvaluation
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Seven Letter Word Alert: (57 words)
aeolian, aileron, aureola, aviator, avivore, elation, elution, involve, latrine, loonier, lunaria, natural, neutral, oration, otarine, outearn, outlier, outline, outlive, outlove, outrave, ovarian, ovation, overlit, ovulate, rainout, ratline, raviolo, reavail, reliant, retinal, retinol, revival, rivulet, routine, toenail, travail, trenail, unalert, unalter, unravel, unrivet, uralite, urinate, valiant, valuate, variant, variate, variola, vaulter, velaria, ventral, violate, violent, virtual, volvent, vulvate