reserved vs upstage

reserved is not a noun while upstage is a noun.

Word	Noun	Adjective	Verb	Adverb
reserved	No	Yes	No	No
upstage	Yes	Yes	Yes	Yes

reserved (noun)	upstage (noun)
	the rear part of the stage

reserved (adjective)	upstage (adjective)
marked by self-restraint and reticence	of the back half of a stage
set aside for the use of a particular person or party	remote in manner

reserved (verb)	upstage (verb)
	steal the show, draw attention to oneself away from someone else
	move upstage, forcing the other actors to turn away from the audience
	treat snobbishly, put in one's place

reserved (adverb)	upstage (adverb)
	at or toward the rear of the stage