line of descent vs pedigree

line of descent and pedigree both are nouns.

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

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

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

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

line of descent (noun)	pedigree (noun)
the hereditary derivation of an individual	ancestry of a purebred animal
the kinship relation between an individual and the individual's progenitors	the hereditary derivation of an individual
	line of descent of a purebred animal

line of descent (adjective)	pedigree (adjective)
	having a list of ancestors as proof of being a purebred animal