The word interleukins 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: 20
Highest Scoring Words With Friends™ Play In The Letters interleukins
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Seven Letter Word Alert: (74 words)
eelskin, eluents, ensuite, entries, inkiest, inlines, insulin, intense, interns, inturns, inulins, kennels, kernels, kernite, kestrel, kilters, kinesin, kirtles, leisure, lenient, lenites, linkers, linnets, lintier, luniest, lustier, netlike, neuters, nitrene, nutlike, nutsier, reknits, relents, relines, relinks, rennets, retiles, retunes, reunite, runnels, rutiles, silkier, siltier, sinlike, skelter, skinner, sterile, stinker, stunner, sulkier, sunlike, sunnier, tenners, tensile, tenures, tinkers, tinkler, tinkles, tinners, tinnier, trienes, trunnel, tunnels, uniters, unities, unlikes, unlinks, unreels, unreset, unrisen, urnlike, utensil, uterine, utilise