whey vs blood serum

whey and blood serum both are nouns.

Word	Noun	Adjective	Verb	Adverb
whey	Yes	No	No	No
blood serum	Yes	No	No	No

As nouns, blood serum is a hypernym of whey; that is, blood serum is a word with a broader meaning than whey:

whey: the serum or watery part of milk that is separated from the curd in making cheese
blood serum: an amber, watery fluid, rich in proteins, that separates out when blood coagulates

Other hypernyms of whey include serum.

whey (noun)	blood serum (noun)
watery part of milk produced when raw milk sours and coagulates	an amber, watery fluid, rich in proteins, that separates out when blood coagulates
the serum or watery part of milk that is separated from the curd in making cheese