competition vs group action

competition and group action both are nouns.

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

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

competition (noun)	group action (noun)
the act of competing as for profit or a prize	action taken by a group of people
an occasion on which a winner is selected from among two or more contestants
the contestant you hope to defeat
a business relation in which two parties compete to gain customers