cognation vs blood kinship

cognation and blood kinship both are nouns.

Word	Noun	Adjective	Verb	Adverb
cognation	Yes	No	No	No
blood kinship	Yes	No	No	No

As nouns, cognation and blood kinship are synonyms defined as:

cognation and blood kinship: (anthropology) the condition of being related by blood

Other synonyms of cognation include consanguinity.

cognation (noun)	blood kinship (noun)
(anthropology) the condition of being related by blood	(anthropology) the condition of being related by blood
line of descent traced through the maternal side of the family