The word bottomlessness 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 bottomlessness
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Seven Letter Word Alert: (45 words)
benmost, blesses, blossom, boletes, boltons, bonelet, boneset, boomlet, boomnet, bootees, botnets, bottles, bottoms, entombs, lessens, lessons, loosens, loosest, mettles, molests, mottles, mottoes, nestles, netless, nettles, noblest, omelets, osselet, osteons, sestets, setbolt, settles, someone, sonless, soonest, stenose, stetson, teleost, telnets, tensest, toeless, toolmen, toolset, tootles, tsetses