congregation vs social group

congregation and social group both are nouns.

Word	Noun	Adjective	Verb	Adverb
congregation	Yes	No	No	No
social group	Yes	No	No	No

As nouns, social group is a hypernym of congregation; that is, social group is a word with a broader meaning than congregation:

congregation: a group of people who adhere to a common faith and habitually attend a given church
social group: people sharing some social relation

congregation (noun)	social group (noun)
the act of congregating	people sharing some social relation
a group of people who adhere to a common faith and habitually attend a given church
an assemblage of people or animals or things collected together