pennywhistle vs fipple pipe

pennywhistle and fipple pipe both are nouns.

Word	Noun	Adjective	Verb	Adverb
pennywhistle	Yes	No	No	No
fipple pipe	Yes	No	No	No

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

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

Other hypernyms of pennywhistle include fipple flute, recorder, vertical flute.

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