The word invulnerability 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: 29
Highest Scoring Words With Friends™ Play In The Letters invulnerability
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Seven Letter Word Alert: (87 words)
ability, abluent, airline, alertly, aniline, annuity, annulet, bairnly, biennia, bilayer, biliary, blarney, blunter, bluntly, braille, bravely, brevity, bullate, byliner, eluvial, entrain, ilvaite, inanely, inertia, inertly, initial, inlayer, inviter, irately, lantern, latrine, liberal, liberty, lintier, literal, livable, naively, naivety, nebular, netball, neutral, nullity, ratline, reality, rebuilt, reliant, retally, retinal, rivulet, rubella, tallier, tannery, tearily, tenably, tinnier, tinnily, trenail, triable, tribune, trivial, trunnel, tunable, tunably, turbine, unalert, unalter, unblent, unearnt, unitary, unlayer, unlearn, unravel, unrivet, uralite, urinate, variety, vaulter, ventral, vibrant, vibrate, villain, vintner, virally, virtual, vitally, vitelli, vitrine