kinship group vs clan

kinship group and clan both are nouns.

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

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

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

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