The word heterosexism 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: 24
Highest Scoring Words With Friends™ Play In The Letters heterosexism
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Seven Letter Word Alert: (59 words)
eeriest, emerses, emoters, erotise, esteems, exhorts, extreme, heiress, hermits, heroise, heroism, hessite, heteros, homiest, hosiers, isomere, isomers, meeters, meioses, meshers, meshier, messier, meteors, metrise, missort, misters, mitoses, moister, mortise, mossier, mothers, reemits, rehomes, remeets, remixes, remotes, reshims, reshoes, restems, retimes, rosiest, seether, seethes, sexiest, sheeter, smiters, smother, soirees, somites, sorties, stereos, stomies, stories, teemers, theisms, theorem, thermos, xeroses, xerosis