stand up vs line up

stand up and line up both are verbs.

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

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

Other hyponyms of stand up include ramp, stand back, queue, queue up.

stand up (verb)	line up (verb)
defend against attack or criticism	place in a line or arrange so as to be parallel or straight
refuse to back down; remain solid under criticism or attack	take one's position before a kick-off
be standing; be upright	arrange in ranks
put into an upright position	form a queue, form a line, stand in line
rise to one's feet	get something or somebody for a specific purpose
rise up as in fear	form a line
resist or withstand wear, criticism, etc.