Glassblowing rhymes with:
overflowing, churchgoing, elbowing, farrowing, moviegoing, oceangoing, ongoing, outgoing, outgrowing, overflowing, overthrowing, seagoing, tiptoeing, torpedoing, winnowing
overflowing, churchgoing, elbowing, farrowing, moviegoing, oceangoing, ongoing, outgoing, outgrowing, overflowing, overthrowing, seagoing, tiptoeing, torpedoing, winnowing