The word lentiginous 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: 17
Highest Scoring Words With Friends™ Play In The Letters lentiginous
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Seven Letter Word Alert: (61 words)
elision, elogist, eloigns, elusion, eluting, elution, ensuing, glisten, gluiest, glutens, igneous, ignites, inlines, inosine, inosite, insulin, intones, inulins, iolites, legions, lensing, lignins, lignite, lingoes, linings, linnets, lionets, lionise, listing, longest, lounges, lousing, luniest, lusting, nesting, nonsuit, oiliest, oligist, ousting, outings, outlies, outline, silting, singlet, soiling, stoning, suiting, tensing, tension, tilings, tingles, toiling, tongues, tunings, tunnels, ugliest, unities, uniting, unsling, utensil, utilise