ingroup vs inner circle

ingroup and inner circle both are nouns.

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

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

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

Other synonyms of ingroup include camp, clique, coterie, pack.

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