stampede vs group action

stampede and group action both are nouns.

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

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

stampede (noun)	group action (noun)
a headlong rush of people on a common impulse	action taken by a group of people
a wild headlong rush of frightened animals (horses or cattle)

stampede (verb)	group action (verb)
run away in a stampede
cause to run in panic
act, usually en masse, hurriedly or on an impulse
cause a group or mass of people to act on an impulse or hurriedly and impulsively