social movement vs social group

social movement and social group both are nouns.

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

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

social movement: a group of people with a common ideology who try together to achieve certain general goals
social group: people sharing some social relation

social movement (noun)	social group (noun)
a group of people with a common ideology who try together to achieve certain general goals	people sharing some social relation