The word hesitater 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: 11
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (27 words)
aeriest, artiest, atheise, atheist, attires, hastier, hatters, heaters, hitters, iratest, iterate, rattish, reheats, restate, retaste, seriate, shatter, striate, tartish, tastier, testier, tethers, theater, theatre, thereat, threats, tithers