fringe vs social group

fringe and social group both are nouns.

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

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

fringe (noun)	social group (noun)
an ornamental border consisting of short lengths of hanging threads or tassels	people sharing some social relation
a border of hair that is cut short and hangs across the forehead
a social group holding marginal or extreme views
a part of the city far removed from the center
one of the light or dark bands produced by the interference and diffraction of light
the outside boundary or surface of something

fringe (verb)	social group (verb)
decorate with or as if with a surrounding fringe
adorn with a fringe