unilateral descent vs filiation

unilateral descent and filiation both are nouns.

Word	Noun	Adjective	Verb	Adverb
unilateral descent	Yes	No	No	No
filiation	Yes	No	No	No

As nouns, filiation is a hypernym of unilateral descent; that is, filiation is a word with a broader meaning than unilateral descent:

unilateral descent: line of descent traced through one side of the family
filiation: the kinship relation between an individual and the individual's progenitors

Other hypernyms of unilateral descent include descent, line of descent, lineage.

unilateral descent (noun)	filiation (noun)
line of descent traced through one side of the family	inherited properties shared with others of your bloodline
	the kinship relation between an individual and the individual's progenitors