blood vs family line

blood and family line both are nouns.

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

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

Other hyponyms of blood include family, folk, kinfolk, kinsfolk, phratry, sept, side, breed line.

blood (noun)	family line (noun)
temperament or disposition	people descended from a common ancestor
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 (verb)	family line (verb)
smear with blood, as in a hunting initiation rite, where the face of a person is smeared with the blood of the kill