The word materialists 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 materialists
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Seven Letter Word Alert: (97 words)
aerials, aimless, airiest, airless, airmail, airmass, airtime, aliases, amritas, armless, armlets, artiest, artists, artless, atlases, atresia, attires, elitism, elitist, imitate, iratest, irisate, lariats, latites, liaises, limiter, litters, mailers, malaise, maltier, marital, marlite, martial, masters, matters, metrist, militar, misseat, missile, misters, mistier, mistral, mitiest, rattail, rattles, realism, realist, relists, remails, resails, retails, retilts, rimless, sailers, salamis, saltate, saltier, satiate, satires, searats, seastar, serials, siltier, similar, similes, siriema, sitters, slaters, slatier, slimier, slitter, smartie, smatter, smilers, smilier, smiters, stalest, starlet, starlit, startle, staters, statism, stilter, stimies, straits, stratas, streams, striate, tamales, tarsals, tasters, tastier, tertial, tilters, tramels, tsarism, tsarist