participation vs group action

participation and group action both are nouns.

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

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

participation (noun)	group action (noun)
the act of sharing in the activities of a group	action taken by a group of people
the condition of sharing in common with others (as fellows or partners etc.)