Greylag rhymes with:
airbag, bandag, bundestag, handbag, hapag, mailbag, maytag, ragtag, saddlebag, sandbag, sontag, zig-zag
Greylag sounds like:
garelick, garlic, garlick, garlicky, garlock, garols, garrels, garrols, garrulous, gerlach, gerlich, gerlock, girl's, girlish, girls, girls', goralski, gorelick, gorillas, greulich, grills, groulx, growls, gruhlke, grulke, guerillas, guerrillas, guerrillas'