The word invaluableness 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: 26
Highest Scoring Words With Friends™ Play In The Letters invaluableness
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Seven Letter Word Alert: (57 words)
abseils, abulias, abusive, alanine, albinal, aliases, alluvia, anneals, annuals, avenues, baleens, beanies, bellies, beslave, bullies, bunnies, elusive, eluvial, enables, enbuses, enliven, enseals, enslave, evulses, illness, inulase, labials, leavens, lesbian, livable, nabales, nebulae, nebulas, salable, salines, salivas, salvias, savable, sensual, siennas, silanes, silvans, sleaves, snivels, subvein, subvene, sullies, sunnies, unbales, unbless, unseals, unveils, useable, vanilla, veinule, venules, visuals