clan vs kinship group

clan and kinship group both are nouns.

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

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

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

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