inner circle vs ingroup

inner circle and ingroup both are nouns.

Word	Noun	Adjective	Verb	Adverb
inner circle	Yes	No	No	No
ingroup	Yes	No	No	No

As nouns, inner circle and ingroup are synonyms defined as:

inner circle and ingroup: an exclusive circle of people with a common purpose

Other synonyms of inner circle include camp, clique, coterie, pack.

inner circle (noun)	ingroup (noun)
an exclusive circle of people with a common purpose	an exclusive circle of people with a common purpose