The word glassblowers 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: 22
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (40 words)
allegro, bagless, bellows, blowers, borages, bowlegs, bowlers, braless, brasses, browses, gallows, gaolers, garbles, gasless, gassers, glasses, globals, glosser, glosses, glowers, grasses, grosses, largess, lassoer, lassoes, lawless, leasows, lessors, losable, oarless, reallow, reblogs, regloss, reglows, sallows, sowable, warbles, warless, weblogs, wrasses