pipe vs holler

pipe and holler both are nouns.

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

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

Other hypernyms of pipe include call, cry, hollo, scream, shout, shout out, squall, yell.

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