revolving door vs social group

revolving door and social group both are nouns.

Word	Noun	Adjective	Verb	Adverb
revolving door	Yes	No	No	No
social group	Yes	No	No	No

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

revolving door: an organization or institution with a high rate of turnover of personnel or membership
social group: people sharing some social relation

revolving door (noun)	social group (noun)
a door consisting of four orthogonal partitions that rotate about a central pivot; a door designed to equalize the air pressure in tall buildings	people sharing some social relation
an organization or institution with a high rate of turnover of personnel or membership