snowbird vs bunting

snowbird and bunting both are nouns.

Word	Noun	Adjective	Verb	Adverb
snowbird	Yes	No	No	No
bunting	Yes	No	No	No

As nouns, bunting is a hypernym of snowbird; that is, bunting is a word with a broader meaning than snowbird:

snowbird (noun)	bunting (noun)
white Arctic bunting	any of numerous seed-eating songbirds of Europe or North America
small North American finch seen chiefly in winter	a loosely woven fabric used for flags, etc.
medium-sized Eurasian thrush seen chiefly in winter