The word alternators 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: 13
Highest Scoring Words With Friends™ Plays In The Letters alternators
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Seven Letter Word Alert: (49 words)
aerator, antlers, areolar, areolas, arsenal, atoners, errants, latents, leantos, loaners, narrate, natters, orleans, ornater, ranters, ratters, rattler, rattles, rattons, realtor, reloans, rentals, reroast, reslant, restart, retoast, retorts, retotal, roaster, rostral, rotates, rotters, saltate, saltern, sealant, senator, snarler, snorter, snotter, starlet, starter, startle, sternal, talents, tartans, tartars, toaster, torrent, treason