The word blackhearts 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 blackhearts
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Seven Letter Word Alert: (57 words)
abaters, ablates, abreact, abreast, acaters, actable, arblast, archeal, archlet, backers, balkers, batches, bathers, blacker, blaster, blather, bracket, breaths, cabaret, cablers, cartels, chalets, chaster, clarets, clasher, hackers, hackles, halters, hatrack, herbals, lactase, larches, latches, lathers, rackets, rebacks, rebatch, rebaths, reblast, rechalk, restack, retacks, satchel, scarlet, setback, shackle, slacker, slather, stabler, stacker, stalker, tackers, tackler, tackles, talkers, taskbar, trachea