tin whistle vs vertical flute

tin whistle and vertical flute both are nouns.

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

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

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

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

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