Gumbo rhymes with:
colombo, columbo, cumbo, dumbo, jumbo, mumbo, palumbo, stumbo, trumbo, archambault, archambeault, bimbo, colombo, columbo, cumbo, dumbo, gumbo-limbo, jumbo, lembo, limbo, mambo, mumbo, palombo, palumbo, pombo, rambo, rambow, sambo, shambo, stumbo, tambo, trumbo, zambo
Gumbo sounds like:
gamba, gambia, gamboa, gamp, gaskamp, geneva, geneve, genevieve, genova, ghaznavi, giampa, giampapa, gmbh, gumbi, gump, gumpp, gunby