treble recorder vs shepherd's pipe

treble recorder and shepherd's pipe both are nouns.

Word	Noun	Adjective	Verb	Adverb
treble recorder	Yes	No	No	No
shepherd's pipe	Yes	No	No	No

As nouns, treble recorder and shepherd's pipe are synonyms defined as:

treble recorder and shepherd's pipe: a small fipple flute with four finger holes and two thumb holes

Other synonyms of treble recorder include flageolet.

treble recorder (noun)	shepherd's pipe (noun)
a small fipple flute with four finger holes and two thumb holes	a small fipple flute with four finger holes and two thumb holes
	a small bagpipe formerly popular in France