contention vs group action

contention and group action both are nouns.

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

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

contention (noun)	group action (noun)
the act of competing as for profit or a prize	action taken by a group of people
a contentious speech act; a dispute where there is strong disagreement
a point asserted as part of an argument