The word counterfoil 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 counterfoil
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Seven Letter Word Alert: (29 words)
cloture, confute, conifer, contour, control, coronet, coulter, counter, crouton, cutline, ecotour, elution, ferulic, flounce, flouter, fortune, functor, inflect, lection, loftier, loonier, outfire, outlier, outline, recount, retinol, routine, trefoil, trounce