The word counterbores 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 counterbores
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Seven Letter Word Alert: (91 words)
becrust, bescour, boneset, booster, bootees, booters, boreens, bouncer, bounces, broncos, burners, butenes, cenotes, censure, centers, centres, cobnuts, consort, contour, corners, cornets, coroner, coronet, counter, courser, crooner, crouton, crubeen, current, ecotour, encores, encrust, enrober, enrobes, ensurer, erector, estrone, necrose, neuters, obscene, obscure, obtuser, octenes, october, onerous, reboost, reboots, rebores, reburns, reburst, recount, rectors, recures, recurse, renters, rerents, reroots, reroute, rescore, rescrub, rescuer, restore, retours, retunes, returns, rooster, rooters, routers, scenter, scooter, scorner, scourer, scouter, securer, snorter, soberer, sterner, subnote, subtone, subtree, tenures, tonsure, tourers, trounce, trouser, turners, unboots, unerect, unreset, unrobes, ureters