The word fruitfulness 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: 22
Highest Scoring Words With Friends™ Play In The Letters fruitfulness
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Seven Letter Word Alert: (71 words)
enlists, filters, finless, fissure, fistful, fistule, fitness, fluents, fluster, fluters, fretful, funfest, furless, fussier, futures, infests, infuser, infuses, inserts, insults, insures, lifters, listens, luniest, lusters, lustier, nutsier, relists, resifts, restful, restuff, results, ruffles, rustles, rutiles, sifters, silents, sinters, sniffer, sniffle, snifter, snuffer, snuffes, snuffle, stiffen, stiffer, stifler, stifles, strifes, stuffer, suffers, suffuse, suiters, sulfite, sulfurs, sunrise, surfeit, sutlers, sutures, tinfuls, tinsels, trifles, truffle, tuneful, unfurls, uniters, unlists, unrests, unstuff, urnfuls, utensil