The word woolgatherer 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: 20
Highest Scoring Words With Friends™ Plays In The Letters
Seven Letter Word Alert: (26 words)
aerogel, alerter, gloater, greater, growler, hogwort, leather, loather, ragwort, rathole, realter, realtor, regrate, relater, rethrow, rewater, rewrote, thrower, trawler, wagerer, warthog, waterer, weather, whereat, whereto, wreathe