desegregation vs group action

desegregation and group action both are nouns.

Word	Noun	Adjective	Verb	Adverb
desegregation	Yes	No	No	No
group action	Yes	No	No	No

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

desegregation: the action of incorporating a racial or religious group into a community
group action: action taken by a group of people

desegregation (noun)	group action (noun)
the action of incorporating a racial or religious group into a community	action taken by a group of people