The word unalterability 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 unalterability
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Seven Letter Word Alert: (94 words)
abettal, abeyant, ability, abluent, abuttal, abutter, airable, airline, albinal, alertly, allayer, analyte, arylate, bairnly, banaler, banally, battery, battier, battler, bilayer, biliary, bitrate, bittier, blarney, blatant, blunter, bluntly, braille, brittle, bullate, buttery, byliner, inertia, inertly, inlayer, irately, labiate, lateral, latrine, liberal, liberty, lintier, literal, littler, lunaria, nattier, nattily, natural, nebular, netball, neutral, nitrate, nitrite, nittier, nullity, nuttier, ratbite, ratline, rattail, reality, rebuilt, reliant, retally, retinal, rubella, tabinet, tableau, tabular, tallier, tarball, taunter, tearily, tenably, terabit, tertial, tintier, titular, trenail, triable, tribune, tribute, trinity, tunable, tunably, turbine, unabate, unalert, unalter, unitary, unlayer, uralite, urinate, utility, utterly