combat vs fighting

combat and fighting both are nouns.

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

As nouns, combat and fighting are synonyms defined as:

Other synonyms of combat include fight, scrap.

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

combat (adjective)	fighting (adjective)
	engaged in or ready for military or naval operations

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