dairy product vs butter

dairy product and butter both are nouns.

Word	Noun	Adjective	Verb	Adverb
dairy product	Yes	No	No	No
butter	Yes	No	Yes	No

As nouns, butter is a hyponym of dairy product; that is, butter is a word with a more specific, narrower meaning than dairy product:

dairy product: milk and butter and cheese
butter: an edible emulsion of fat globules made by churning milk or cream; for cooking and table use

Other hyponyms of dairy product include milk, cream, half-and-half, yoghourt, yoghurt, yogurt, whey, curd, clabber, cheese.

dairy product (noun)	butter (noun)
milk and butter and cheese	an edible emulsion of fat globules made by churning milk or cream; for cooking and table use
	a fighter who strikes the opponent with his head

dairy product (verb)	butter (verb)
	spread butter on