The word countervail 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: 21
Highest Scoring Words With Friends™ Play In The Letters countervail
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Seven Letter Word Alert: (83 words)
aconite, activer, aileron, aloetic, article, auction, auricle, calorie, carvone, cauline, caution, caviler, centaur, central, certain, clarion, clavier, cloture, coalier, coalite, convert, corneal, coulter, counter, culvert, curtail, curtain, cutline, cutover, elation, elution, enactor, erotica, evictor, incurve, lactone, latrine, lection, lunatic, neutral, nuclear, otarine, outearn, outlier, outline, outlive, outrace, outrave, overact, overcut, overlit, ovulate, rainout, ratline, recital, recount, reliant, retinal, retinol, rivulet, routine, toenail, trenail, trounce, truncal, unalert, unalter, unclear, uncover, uncrate, unravel, unrivet, uralite, urinate, vacuole, vaulter, velaric, ventral, victual, violate, violent, virtual, voltaic