war vs armed combat

war and armed combat both are nouns.

Word	Noun	Adjective	Verb	Adverb
war	Yes	No	Yes	No
armed combat	Yes	No	No	No

war (noun)	armed combat (noun)
the waging of armed conflict against an enemy	an engagement fought between two military forces
a concerted campaign to end something that is injurious
an active struggle between competing entities
a legal state created by a declaration of war and ended by official declaration during which the international rules of war apply

war (verb)	armed combat (verb)
make or wage war