The word collectivists 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: 25
Highest Scoring Words With Friends™ Play In The Letters collectivists
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Seven Letter Word Alert: (26 words)
cellist, ciscoes, clitics, closest, closets, colitis, collect, collies, cosiest, elicits, elitist, icicles, illites, iolites, oecists, oiliest, ossicle, ovicell, silicle, solicit, tictocs, toilets, violets, violist, vitelli, vittles