armed forces vs combat

armed forces and combat both are nouns.

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

armed forces (noun)	combat (noun)
the military forces of a nation	an engagement fought between two military forces
	the act of fighting; any contest or struggle

armed forces (verb)	combat (verb)
	battle or contend against in or as if in a battle