dueler vs resister

dueler and resister both are nouns.

Word	Noun	Adjective	Verb	Adverb
dueler	Yes	No	No	No
resister	Yes	No	No	No

As nouns, resister is a hypernym of dueler; that is, resister is a word with a broader meaning than dueler:

Other hypernyms of dueler include adversary, antagonist, opponent, opposer.

dueler (noun)	resister (noun)
a person who fights duels	someone who systematically obstructs some action that others want to take
	someone who offers opposition