The word counterfire 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: 19
Highest Scoring Words With Friends™ Play In The Letters counterfire
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Seven Letter Word Alert: (34 words)
confute, conifer, cornier, coterie, counter, courier, crofter, current, enforce, enteric, enticer, erector, ferrite, fiercer, fortune, functor, inerter, oftener, outfire, reciter, recount, recruit, refiner, refuter, reincur, reinter, reroute, reunite, routine, runtier, trounce, turfier, unerect, uterine