cognate vs sib

cognate and sib both are nouns.

Word	Noun	Adjective	Verb	Adverb
cognate	Yes	Yes	No	No
sib	Yes	No	No	No

As nouns, cognate and sib are synonyms defined as:

cognate and sib: one related by blood or origin; especially on sharing an ancestor with another

Other synonyms of cognate include blood relation, blood relative.

cognate (noun)	sib (noun)
a word is cognate with another if both derive from the same word in an ancestral language	one related by blood or origin; especially on sharing an ancestor with another
one related by blood or origin; especially on sharing an ancestor with another	a person's brother or sister

cognate (adjective)	sib (adjective)
related by blood
having the same ancestral language
related in nature