line of descent vs filiation

line of descent and filiation both are nouns.

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

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

line of descent and filiation: the kinship relation between an individual and the individual's progenitors

Other synonyms of line of descent include descent, lineage.

line of descent (noun)	filiation (noun)
the hereditary derivation of an individual	inherited properties shared with others of your bloodline
the kinship relation between an individual and the individual's progenitors	the kinship relation between an individual and the individual's progenitors