The word matureness 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: 15
Highest Scoring Words With Friends™ Plays In The Letters matureness
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Seven Letter Word Alert: (51 words)
artsmen, assumer, austere, earnest, eastern, ensears, ensures, estrums, euaster, manures, martens, masseur, masters, matures, meanest, measure, musters, natures, nearest, nesters, neuters, remates, renames, renests, reseats, resents, restems, resumes, reteams, retunes, sateens, saunter, seamers, seaters, senates, sensate, smarten, stamens, steamer, sterane, sternum, streams, sunstar, surname, teasers, tenures, unmates, unreset, unrests, unseats, ureases