The word neutrinos 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: 12
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (25 words)
interns, intoner, intones, introns, inturns, neurons, neutron, nitrous, nonsuit, nonuser, norites, nutsier, orients, reunion, routine, stonier, stourie, stunner, sunnier, tension, tinners, tonsure, triones, uniters, unrisen