The word popularisers 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: 20
Highest Scoring Words With Friends™ Plays In The Letters popularisers
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Seven Letter Word Alert: (99 words)
airless, applier, applies, apposer, apposes, apprise, arouser, arouses, aspirer, aspires, lassoer, leprous, lipases, lispers, loppers, lorries, lossier, lousier, oarless, oppress, palsies, papules, paresis, parlors, parlour, paroles, parsers, paupers, perusal, pileups, poplars, popular, poseurs, pourers, praiser, praises, pressup, propels, prosper, pulpers, pulpier, pulsars, pulsers, purpler, purples, purpose, pursers, pussier, raisers, rappels, rappers, raspers, raspier, repairs, repours, resails, resoils, resorps, rippers, rippler, ripples, sailers, sailors, sappers, sappier, serials, serious, sierras, sippers, slipper, slipups, slopers, soapers, soapier, soarers, soppers, soppier, sorrels, soupier, sparers, sparser, spirals, spireas, spoiler, sporule, spousal, suppers, suppler, suppose, surlier, surreal, suspire, upraise, uprears, uprisal, upriser, uprises, uproars, upslope