The word defoliants 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: 16
Highest Scoring Words With Friends™ Play In The Letters defoliants
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Seven Letter Word Alert: (45 words)
adonise, anodise, daltons, defiant, delints, denials, dentals, dentils, destain, details, detains, dilates, donates, elastin, elation, enfolds, entails, fadeins, fainted, finales, floated, foisted, folates, foliate, fondest, fondles, indoles, inflate, infolds, instead, isolate, leantos, lionets, nailset, olefins, sainted, salient, sealion, slanted, snailed, stained, stifled, talonid, tenfold, toenail