The word multipliers 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 multipliers
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Seven Letter Word Alert: (52 words)
elitism, illites, imperil, impetus, implies, impulse, limelit, limiter, limpest, limpets, lumpier, lustier, millers, millets, misrule, mistell, mistier, mullers, mullets, mullite, mustier, permits, pietism, pitiers, plumier, prelims, pullers, pullets, resplit, restump, retills, rillets, rumples, rutiles, sillier, siltier, simpler, slimier, smilier, spiller, spumier, stiller, stimuli, stipule, stumper, tillers, tipsier, trellis, triples, umpires, uptimes, utilise