blood kinship vs cognation

blood kinship and cognation both are nouns.

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

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

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

Other synonyms of blood kinship include consanguinity.

blood kinship (noun)	cognation (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