fipple pipe vs vertical flute

fipple pipe and vertical flute both are nouns.

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

As nouns, fipple pipe and vertical flute are synonyms defined as:

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

Other synonyms of fipple pipe include fipple flute, recorder.

fipple pipe (noun)	vertical flute (noun)
a tubular wind instrument with 8 finger holes and a fipple mouthpiece	a tubular wind instrument with 8 finger holes and a fipple mouthpiece