dairy product vs whey

dairy product and whey both are nouns.

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

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

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

dairy product (noun)	whey (noun)
milk and butter and cheese	watery part of milk produced when raw milk sours and coagulates
	the serum or watery part of milk that is separated from the curd in making cheese