subculture vs social group

subculture and social group both are nouns.

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

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

subculture: a social group within a national culture that has distinctive patterns of behavior and beliefs
social group: people sharing some social relation

subculture (noun)	social group (noun)
a social group within a national culture that has distinctive patterns of behavior and beliefs	people sharing some social relation