The word antagonised 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 antagonised
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Seven Letter Word Alert: (51 words)
adonise, against, agatine, agatise, agatoid, agendas, agnosia, agonies, agonise, agonist, andante, anginas, anodise, anoints, antigen, atonias, atoning, denting, dentins, destain, detains, donates, dotages, endings, gentian, goannas, godetia, godsent, indents, instead, intends, intoned, intones, nations, nesting, nondate, nondiet, onstage, sainted, sanding, seating, sending, stained, stoning, tangoed, teasing, tending, tendons, tensing, tension, tonnage