tin whistle vs fipple flute

tin whistle and fipple flute both are nouns.

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

As nouns, fipple flute is a hypernym of tin whistle; that is, fipple flute is a word with a broader meaning than tin whistle:

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

Other hypernyms of tin whistle include fipple pipe, recorder, vertical flute.

tin whistle (noun)	fipple flute (noun)
an inexpensive fipple flute	a tubular wind instrument with 8 finger holes and a fipple mouthpiece