vertical flute vs pipe

vertical flute and pipe both are nouns.

Word	Noun	Adjective	Verb	Adverb
vertical flute	Yes	No	No	No
pipe	Yes	No	Yes	No

As nouns, pipe is a hypernym of vertical flute; that is, pipe is a word with a broader meaning than vertical flute:

vertical flute: a tubular wind instrument with 8 finger holes and a fipple mouthpiece
pipe: a tubular wind instrument

vertical flute (noun)	pipe (noun)
a tubular wind instrument with 8 finger holes and a fipple mouthpiece	a long tube made of metal or plastic that is used to carry water or oil or gas etc.
	a tube with a small bowl at one end; used for smoking tobacco
	the flues and stops on a pipe organ
	a tubular wind instrument
	a hollow cylindrical shape