whey vs milk whey

whey and milk whey both are nouns.

Word	Noun	Adjective	Verb	Adverb
whey	Yes	No	No	No
milk whey	Yes	No	No	No

As nouns, whey and milk whey are synonyms defined as:

whey and milk whey: the serum or watery part of milk that is separated from the curd in making cheese

whey (noun)	milk whey (noun)
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
the serum or watery part of milk that is separated from the curd in making cheese