Here's what rhymes with gbaa.
da awe jaw aa ah pa ta aw paw cha oí où baa bah aah law la saw draw raw ha ma na sa wa ya ja ka ra bra ga spa thaw trois waa bois faw gnaw haa maw ois sha shah blah hah haw nah rah yaw caw sough pshaw soh rawer straw qua claw fhall flaw moi aha pasha craw lockjaw pawpaw slaw inlaw ulna alga chamois squaw travaux hurrah overawe patois guffaw macaw redraw baccarat jackdaw southpaw loofah outdraw borzois geegaw bourgeois withdraw foresaw oversaw voila fuchsia panama overdraw markkaa uninstall mackinaw scofflaw