enemy vs military force

enemy and military force both are nouns.

Word	Noun	Adjective	Verb	Adverb
enemy	Yes	No	No	No
military force	Yes	No	No	No

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

Other hypernyms of enemy include force, military group, military unit.

enemy (noun)	military force (noun)
an opposing military force	a unit that is part of some military service
any hostile group of people
an armed adversary (especially a member of an opposing military force)
a personal enemy