combat vs battle

combat and battle both are nouns.

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

As nouns, battle is a hypernym of combat; that is, battle is a word with a broader meaning than combat:

combat: an engagement fought between two military forces
battle: a hostile meeting of opposing military forces in the course of a war

Other hypernyms of combat include conflict, engagement, fight.

As nouns, battle is a hypernym of combat; that is, battle is a word with a broader meaning than combat:

Other hypernyms of combat include conflict, struggle.

As verbs, combat and battle are synonyms defined as:

combat (noun)	battle (noun)
an engagement fought between two military forces	a hostile meeting of opposing military forces in the course of a war
the act of fighting; any contest or struggle	an energetic attempt to achieve something
	an open clash between two opposing groups (or individuals)

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