encirclement vs military action

encirclement and military action both are nouns.

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

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

encirclement: a war measure that isolates some area of importance to the enemy
military action: a military engagement

Other hypernyms of encirclement include action.

encirclement (noun)	military action (noun)
a war measure that isolates some area of importance to the enemy	a military engagement