The word omnipresence 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: 23
Highest Scoring Words With Friends™ Play In The Letters omnipresence
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Seven Letter Word Alert: (51 words)
coiners, compere, copiers, crimson, crispen, cronies, empires, encores, enemies, epicene, epimers, episome, imposer, incense, incomer, incomes, isomere, mercies, microns, mincers, miocene, necrose, nominee, nonepic, openers, penners, pennies, pension, peonies, pierces, pincers, pinenes, pioneer, porcine, precise, preemie, premise, princes, promise, recipes, recoins, remines, reopens, repines, rescope, respice, ropemen, seepier, sincere, spermic, spinner