The word vasodilators 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: 18
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (23 words)
advisor, astroid, aviator, dalasis, dilator, disroot, dorsals, lariats, ovaloid, ovoidal, radials, raviolo, sailors, salivas, salvias, saviors, soloist, sortals, tailors, tarsals, toroids, travail, variola