The word kindhearted 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
Seven Letter Word Alert: (42 words)
adhered, arenite, dandier, deaired, deinked, detrain, detrend, diehard, diether, dihedra, drained, earthed, earthen, hairnet, handier, headier, hearken, hearted, hearten, keratin, kernite, kindred, kneaded, kneader, neither, readied, redated, redhead, reinked, retaken, rethank, rethink, thanked, thanker, therein, thinker, tradein, trained, trainee, treaded, trended, triaene