defend vs stand up

defend and stand up both are verbs.

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

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

defend (verb)	stand up (verb)
argue or speak in defense of	defend against attack or criticism
state or assert	refuse to back down; remain solid under criticism or attack
be on the defensive; act against an attack	be standing; be upright
protect against a challenge or attack	put into an upright position
protect or fight for as a champion	rise to one's feet
fight against or resist strongly	rise up as in fear
be the defense counsel for someone in a trial	resist or withstand wear, criticism, etc.