sortie vs military action

sortie and military action both are nouns.

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

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

sortie: a military action in which besieged troops burst forth from their position
military action: a military engagement

Other hypernyms of sortie include action.

sortie (noun)	military action (noun)
a military action in which besieged troops burst forth from their position	a military engagement
(military) an operational flight by a single aircraft (as in a military operation)