line of descent vs kinship

line of descent and kinship both are nouns.

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

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

line of descent: the kinship relation between an individual and the individual's progenitors
kinship: (anthropology) relatedness or connection by blood or marriage or adoption

Other hypernyms of line of descent include family relationship, relationship.

line of descent (noun)	kinship (noun)
the hereditary derivation of an individual	(anthropology) relatedness or connection by blood or marriage or adoption
the kinship relation between an individual and the individual's progenitors	a close connection marked by community of interests or similarity in nature or character