fipple flute vs whistle

fipple flute and whistle both are nouns.

Word	Noun	Adjective	Verb	Adverb
fipple flute	Yes	No	No	No
whistle	Yes	No	Yes	No

As nouns, whistle is a hyponym of fipple flute; that is, whistle is a word with a more specific, narrower meaning than fipple flute:

fipple flute: a tubular wind instrument with 8 finger holes and a fipple mouthpiece
whistle: an inexpensive fipple flute

Other hyponyms of fipple flute include flageolet, shepherd's pipe, treble recorder, pennywhistle, tin whistle.

fipple flute (noun)	whistle (noun)
a tubular wind instrument with 8 finger holes and a fipple mouthpiece	an inexpensive fipple flute
	acoustic device that forces air or steam against an edge or into a cavity and so produces a loud shrill sound
	a small wind instrument that produces a whistling sound by blowing into it
	the act of signalling (e.g., summoning) by whistling or blowing a whistle
	the sound made by something moving rapidly or by steam coming out of a small aperture

fipple flute (verb)	whistle (verb)
	utter or express by whistling
	make a whining, ringing, or whistling sound
	give a signal by whistling
	move with, or as with, a whistling sound
	move, send, or bring as if by whistling
	make whistling sounds