blood vs blood line

blood and blood line both are nouns.

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

As nouns, blood and blood line are synonyms defined as:

blood (noun)	blood line (noun)
temperament or disposition	the hereditary derivation of an individual
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)	blood 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