shepherd's pipe vs bagpipe

shepherd's pipe and bagpipe both are nouns.

Word	Noun	Adjective	Verb	Adverb
shepherd's pipe	Yes	No	No	No
bagpipe	Yes	No	No	No

As nouns, bagpipe is a hypernym of shepherd's pipe; that is, bagpipe is a word with a broader meaning than shepherd's pipe:

shepherd's pipe: a small bagpipe formerly popular in France
bagpipe: a tubular wind instrument; the player blows air into a bag and squeezes it out through the drone

shepherd's pipe (noun)	bagpipe (noun)
a small fipple flute with four finger holes and two thumb holes	a tubular wind instrument; the player blows air into a bag and squeezes it out through the drone
a small bagpipe formerly popular in France