affaire d'honneur vs combat

affaire d'honneur and combat both are nouns.

Word	Noun	Adjective	Verb	Adverb
affaire d'honneur	Yes	No	No	No
combat	Yes	No	Yes	No

As nouns, combat is a hypernym of affaire d'honneur; that is, combat is a word with a broader meaning than affaire d'honneur:

affaire d'honneur: a prearranged fight with deadly weapons by two people (accompanied by seconds) in order to settle a quarrel over a point of honor
combat: the act of fighting; any contest or struggle

Other hypernyms of affaire d'honneur include fight, fighting, scrap.

affaire d'honneur (noun)	combat (noun)
a prearranged fight with deadly weapons by two people (accompanied by seconds) in order to settle a quarrel over a point of honor	an engagement fought between two military forces
	the act of fighting; any contest or struggle

affaire d'honneur (verb)	combat (verb)
	battle or contend against in or as if in a battle