The word illuminances 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 illuminances
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Seven Letter Word Alert: (38 words)
acumens, alliums, alumels, amnesic, aniline, asinine, caesium, canines, cauline, cinemas, cuisine, emulsic, emulsin, encalms, icemans, incline, inlines, insulin, inulase, inulins, laicise, leucism, lineman, macules, malices, malleus, melanin, menisci, mensual, micella, miscall, musical, niacins, nuances, seminal, silicle, unclean, unlaces