The word reconverts 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: 18
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (30 words)
cenotes, centers, centres, convert, corners, cornets, coverer, coverts, coveter, encores, erector, estrone, necrose, octenes, overset, recover, rectors, renters, rerents, rescore, restore, reverts, revotes, scenter, scorner, snorter, sterner, vectors, vetoers, voteens