fighter vs withstander

fighter and withstander both are nouns.

Word	Noun	Adjective	Verb	Adverb
fighter	Yes	No	No	No
withstander	Yes	No	No	No

As nouns, withstander is a hyponym of fighter; that is, withstander is a word with a more specific, narrower meaning than fighter:

fighter (noun)	withstander (noun)
a high-speed military or naval airplane designed to destroy enemy aircraft in the air	an opponent who resists with force or resolution
someone who fights (or is fighting)	a fighter who holds out against attack
someone who fights for a cause