The word noninterference 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: 25
Highest Scoring Words With Friends™ Play In The Letters noninterference
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Seven Letter Word Alert: (30 words)
confine, conifer, cornier, coterie, crofter, enforce, enterer, enteric, enticer, erecter, erector, ferrite, fiercer, inerter, inferno, intoner, nitrene, nonfire, nonfree, oftener, reciter, reefier, reenter, reerect, refence, referee, refiner, reinter, retiree, teenier