withstand vs stand up

withstand and stand up both are verbs.

Word	Noun	Adjective	Verb	Adverb
withstand	No	No	Yes	No
stand up	No	No	Yes	No

As verbs, stand up is a hyponym of withstand; that is, stand up is a word with a more specific, narrower meaning than withstand:

Other hyponyms of withstand include stand out, outbrave, hold off, remain firm, stand, defy, hold, hold up, withstand.

withstand (verb)	stand up (verb)
stand up or offer resistance to somebody or something	defend against attack or criticism
resist or confront with resistance	refuse to back down; remain solid under criticism or attack
	be standing; be upright
	put into an upright position
	rise to one's feet
	rise up as in fear
	resist or withstand wear, criticism, etc.