yowl vs pipe

yowl and pipe both are nouns.

Word	Noun	Adjective	Verb	Adverb
yowl	Yes	No	Yes	No
pipe	Yes	No	Yes	No

As verbs, pipe is a hypernym of yowl; that is, pipe is a word with a broader meaning than yowl:

Other hypernyms of yowl include pipe up, shriek, shrill.

yowl (noun)	pipe (noun)
a very loud utterance (like the sound of an animal)	a long tube made of metal or plastic that is used to carry water or oil or gas etc.
	a tube with a small bowl at one end; used for smoking tobacco
	the flues and stops on a pipe organ
	a tubular wind instrument
	a hollow cylindrical shape