The word popularizers 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: 29
Highest Scoring Words With Friends™ Play In The Letters popularizers
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Seven Letter Word Alert: (59 words)
applier, applies, apposer, apprise, apprize, arouser, aspirer, leprous, loppers, lorries, lousier, opalize, papules, parlors, parlour, paroles, paupers, perusal, pileups, poplars, popular, pourers, praiser, propels, prosper, pulpers, pulpier, purpler, purples, purpose, rappels, rappers, raspier, repairs, repours, rippers, rippler, ripples, sappier, slipper, soapier, soppier, soupier, spoiler, sporule, suppler, surlier, surreal, upraise, uprears, uprisal, upriser, uproars, upslope, urazole, zappers, zappier, zealous, zippers