upright vs stand-up

upright is a noun but stand-up is not a noun.

Word	Noun	Adjective	Verb	Adverb
upright	Yes	Yes	No	No
stand-up	No	Yes	No	No

upright (noun)	stand-up (noun)
a piano with a vertical sounding board
a vertical structural member as a post or stake

upright (adjective)	stand-up (adjective)
upright in position or posture	requiring a standing position
of moral excellence
in a vertical position; not sloping