withstander vs fighter

withstander and fighter both are nouns.

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

As nouns, fighter is a hypernym of withstander; that is, fighter is a word with a broader meaning than withstander:

Other hypernyms of withstander include battler, belligerent, combatant, scrapper.

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