The word ephemeralness 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 ephemeralness
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Seven Letter Word Alert: (73 words)
alpeens, amperes, armless, arsheen, asperse, earless, elapses, emerses, empanel, emplane, empress, enamels, enseals, ensears, hampers, hapless, harness, healers, heapers, hearses, helpers, lashers, leaners, leapers, leasers, leashes, manless, mapless, marshes, mashers, measles, meshers, napless, peelers, pheeses, phrases, planers, plasher, plashes, pleaser, pleases, presale, reheaps, reheels, relapse, release, renames, repanel, repeals, repeels, replane, replans, resales, reseals, reshape, resnaps, respans, sampler, samples, sealers, seamers, serapes, seraphs, shapers, sharpen, sherpas, slasher, sleeper, smasher, spelean, sphenes, spheres, spleens