resister vs withstander

resister and withstander both are nouns.

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

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

Other hyponyms of resister include dueler, duelist, dueller, duellist, enemy, foe, foeman, opposition, Luddite.

resister (noun)	withstander (noun)
someone who systematically obstructs some action that others want to take	an opponent who resists with force or resolution
someone who offers opposition	a fighter who holds out against attack