engagement vs military action

engagement and military action both are nouns.

Word	Noun	Adjective	Verb	Adverb
engagement	Yes	No	No	No
military action	Yes	No	No	No

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

engagement: a hostile meeting of opposing military forces in the course of a war
military action: a military engagement

Other hypernyms of engagement include action.

engagement (noun)	military action (noun)
the act of sharing in the activities of a group	a military engagement
a hostile meeting of opposing military forces in the course of a war
the act of giving someone a job
employment for performers or performing groups that lasts for a limited period of time
a mutual promise to marry
contact by fitting together
a meeting arranged in advance