The word glassblower 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: 21
Highest Scoring Words With Friends™ Plays In The Letters
Seven Letter Word Alert: (30 words)
allegro, bagless, bellows, blowers, borages, bowlegs, bowlers, braless, browses, gallows, gaolers, garbles, globals, glosser, glowers, largess, lassoer, lawless, leasows, losable, oarless, reallow, reblogs, regloss, reglows, sallows, sowable, warbles, warless, weblogs