withstander vs resister

withstander and resister both are nouns.

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

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

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

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