music stand vs music rack

music stand and music rack both are nouns.

Word	Noun	Adjective	Verb	Adverb
music stand	Yes	No	No	No
music rack	Yes	No	No	No

As nouns, music stand and music rack are synonyms defined as:

music stand and music rack: a light stand for holding sheets of printed music

music stand (noun)	music rack (noun)
a light stand for holding sheets of printed music	a light stand for holding sheets of printed music