panpipe vs pandean pipe

panpipe and pandean pipe both are nouns.

Word	Noun	Adjective	Verb	Adverb
panpipe	Yes	No	No	No
pandean pipe	Yes	No	No	No

As nouns, panpipe and pandean pipe are synonyms defined as:

panpipe and pandean pipe: a primitive wind instrument consisting of several parallel pipes bound together

Other synonyms of panpipe include syrinx.

panpipe (noun)	pandean pipe (noun)
a primitive wind instrument consisting of several parallel pipes bound together	a primitive wind instrument consisting of several parallel pipes bound together