The word nonslippery 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: 22
Highest Scoring Words With Friends™ Play In The Letters nonslippery
:
Seven Letter Word Alert: (25 words)
epsilon, leprosy, loppers, nippers, nipples, nonslip, onliner, pension, pleions, poplins, proline, pronely, propels, propine, propyne, pyrones, pyropes, ripples, slipper, snipper, soppier, soppily, spinner, spinney, spoiler