clan vs kin group

clan and kin group both are nouns.

Word	Noun	Adjective	Verb	Adverb
clan	Yes	No	No	No
kin group	Yes	No	No	No

As nouns, clan and kin group are synonyms defined as:

Other synonyms of clan include kin, kindred, kinship group, tribe.

clan (noun)	kin group (noun)
group of people related by blood or marriage	group of people related by blood or marriage