The word rubefacient 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: 22
Highest Scoring Words With Friends™ Play In The Letters rubefacient
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Seven Letter Word Alert: (37 words)
arenite, benefit, brucite, cabinet, cantref, carbeen, carbene, carbine, centaur, certain, crubeen, cuneate, curtain, enteric, enticer, fainter, fancier, feature, fiancee, fibrate, fireant, frantic, furcate, furnace, incubee, infarct, reenact, reunite, trainee, triaene, tribune, turbine, unbrace, uncrate, unerect, urinate, uterine