The word imperialisms 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: 22
Highest Scoring Words With Friends™ Play In The Letters imperialisms
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Seven Letter Word Alert: (53 words)
aimless, airless, armless, aspires, impairs, impaler, impales, impasse, imperil, implies, impress, lempira, liaises, lipases, lispers, mailers, maimers, mapless, mimesis, misaims, missile, palmier, palsies, paresis, pissier, praises, prelims, premiss, primase, prismal, realism, remails, resails, rimless, sailers, sampler, samples, serials, similar, similes, simmers, simpers, simpler, simples, siriema, slammer, slimier, slimmer, smilers, smilier, spammer, spirals, spireas