The word imperialist 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: 18
Highest Scoring Words With Friends™ Play In The Letters imperialist
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Seven Letter Word Alert: (69 words)
airiest, airtime, amplest, aplites, armlets, armpits, elitism, ileitis, impairs, impaler, impales, imparts, imperil, implies, irisate, lempira, limiter, limpest, limpets, mailers, maltier, marlite, militar, militia, mistier, mistral, palmier, palmist, palters, parties, pastier, pastime, permits, piarist, pietism, pilates, pirates, pitiers, plaster, platers, prelims, primase, primate, prismal, realism, realist, remails, replait, resplit, restamp, retails, saltier, sampler, siltier, similar, simpler, siriema, slatier, slimier, smartie, smilier, stamper, stapler, tampers, tipsier, traipse, tramels, trample, triples