Gelb rhymes with:
elbe, selbe, bulb, dekalb, elbe, falb, flashbulb, gilb, hilb, kalb, kielb, kolb, kolbe, lightbulb, schwalb, schwalbe, selbe
Gelb sounds like:
galbo, galeb, galef, galipeau, gallop, gallup, galoob, gelpi, gilb, gilbey, gilbo, gilboy, gilby, glaab, glab, glaub, gleave, gleba, glib, glob, globe, globo, glop, gloppy, glove, golab, golba, golf, golfie, golob, golub, guilbeau, gulf, gulp