outdoor stage vs bandstand

outdoor stage and bandstand both are nouns.

Word	Noun	Adjective	Verb	Adverb
outdoor stage	Yes	No	No	No
bandstand	Yes	No	No	No

As nouns, outdoor stage and bandstand are synonyms defined as:

outdoor stage and bandstand: a platform where a (brass) band can play in the open air

Other synonyms of outdoor stage include stand.

outdoor stage (noun)	bandstand (noun)
a platform where a (brass) band can play in the open air	a platform where a (brass) band can play in the open air