kin group vs kinship group

kin group and kinship group both are nouns.

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

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

kin group and kinship group: group of people related by blood or marriage

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

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