blood serum vs blood

blood serum and blood both are nouns.

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

blood serum (noun)	blood (noun)
an amber, watery fluid, rich in proteins, that separates out when blood coagulates	temperament or disposition
	the fluid (red in vertebrates) that is pumped through the body by the heart and contains plasma, blood cells, and platelets
	the hereditary derivation of an individual
	people viewed as members of a group
	a dissolute man in fashionable society

blood serum (verb)	blood (verb)
	smear with blood, as in a hunting initiation rite, where the face of a person is smeared with the blood of the kill