work stoppage vs job action

work stoppage and job action both are nouns.

Word	Noun	Adjective	Verb	Adverb
work stoppage	Yes	No	No	No
job action	Yes	No	No	No

As nouns, job action is a hypernym of work stoppage; that is, job action is a word with a broader meaning than work stoppage:

work stoppage: a group's refusal to work in protest against low pay or bad work conditions
job action: a temporary action by workers to protest management decision or to make demands

work stoppage (noun)	job action (noun)
a group's refusal to work in protest against low pay or bad work conditions	a temporary action by workers to protest management decision or to make demands