withstander vs adversary

withstander and adversary both are nouns.

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

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

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

withstander (noun)	adversary (noun)
an opponent who resists with force or resolution	someone who offers opposition
a fighter who holds out against attack