The word afterimages 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: 19
Highest Scoring Words With Friends™ Play In The Letters afterimages
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Seven Letter Word Alert: (42 words)
aerates, aeriest, agamete, agatise, aigrets, amritas, atresia, eartags, emirate, faeries, fairest, firmest, freesia, frigate, gaiters, gametes, gamiest, gearset, imagers, margate, meatier, metrise, migrate, mirages, ragtime, reemits, regimes, reimage, remates, remiges, restage, reteams, retimes, seamier, seriate, seriema, sigmate, smartie, stagier, steamer, teargas, triages