The word backcrossed 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: 25
Highest Scoring Words With Friends™ Play In The Letters backcrossed
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Seven Letter Word Alert: (27 words)
accords, adsorbs, arkoses, backers, barcode, bedrock, bedsock, brassed, brocade, cassock, coakers, cracked, croaked, crocked, crossed, debarks, decarbs, dockers, rebacks, recocks, redocks, resoaks, sackers, sarcode, seacock, soakers, soccers