family tree vs blood

family tree and blood both are nouns.

Word	Noun	Adjective	Verb	Adverb
family tree	Yes	No	No	No
blood	Yes	No	Yes	No

As nouns, blood is a hyponym of family tree; that is, blood is a word with a more specific, narrower meaning than family tree:

family tree (noun)	blood (noun)
successive generations of kin	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

family tree (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