bourdon vs drone pipe

bourdon and drone pipe both are nouns.

Word	Noun	Adjective	Verb	Adverb
bourdon	Yes	No	No	No
drone pipe	Yes	No	No	No

As nouns, bourdon and drone pipe are synonyms defined as:

bourdon and drone pipe: a pipe of the bagpipe that is tuned to produce a single continuous tone

Other synonyms of bourdon include drone.

bourdon (noun)	drone pipe (noun)
a pipe of the bagpipe that is tuned to produce a single continuous tone	a pipe of the bagpipe that is tuned to produce a single continuous tone