The word adversative 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™ Plays In The Letters adversative
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Seven Letter Word Alert: (50 words)
adverse, adverts, advisee, adviser, aerated, aerates, aeriest, airdate, aridest, astride, atresia, averted, aviated, aviates, avidest, dearest, dearies, derives, deviate, deviser, diester, dieters, disrate, diverse, diverts, evaders, evasive, radiate, readies, reasted, redates, reedits, resaved, restive, revised, revived, revives, riveted, savvied, savvier, sedater, seriate, sievert, starved, strived, tasered, tiaraed, tirades, variate, veritas