syrinx vs panpipe

syrinx and panpipe both are nouns.

Word	Noun	Adjective	Verb	Adverb
syrinx	Yes	No	No	No
panpipe	Yes	No	No	No

As nouns, syrinx and panpipe are synonyms defined as:

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

Other synonyms of syrinx include pandean pipe.

syrinx (noun)	panpipe (noun)
the vocal organ of a bird	a primitive wind instrument consisting of several parallel pipes bound together
a primitive wind instrument consisting of several parallel pipes bound together