line of descent vs parentage

line of descent and parentage both are nouns.

Word	Noun	Adjective	Verb	Adverb
line of descent	Yes	No	No	No
parentage	Yes	No	No	No

As nouns, line of descent and parentage are synonyms defined as:

line of descent and parentage: the hereditary derivation of an individual

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

line of descent (noun)	parentage (noun)
the hereditary derivation of an individual	the hereditary derivation of an individual
the kinship relation between an individual and the individual's progenitors	the kinship relation of an offspring to the parents
	the state of being a parent