blood line vs descent

blood line and descent both are nouns.

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

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

Other synonyms of blood line include ancestry, blood, bloodline, line, line of descent, lineage, origin, parentage, pedigree, stemma, stock.

blood line (noun)	descent (noun)
the hereditary derivation of an individual	the act of changing your location in a downward direction
	properties attributable to your ancestry
	a movement downward
	the hereditary derivation of an individual
	a downward slope or bend
	the kinship relation between an individual and the individual's progenitors