armed combat vs combat

armed combat and combat both are nouns.

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

As nouns, armed combat and combat are synonyms defined as:

armed combat and combat: an engagement fought between two military forces

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

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