revolution vs group action

revolution and group action both are nouns.

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

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

revolution (noun)	group action (noun)
the overthrow of a government by those who are governed	action taken by a group of people
a single complete turn (axial or orbital)
a drastic and far-reaching change in ways of thinking and behaving