pipe vs hollo

pipe and hollo both are nouns.

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

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

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

pipe (noun)	hollo (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
the flues and stops on a pipe organ
a tubular wind instrument
a hollow cylindrical shape

pipe (verb)	hollo (verb)
utter a shrill cry	utter a sudden loud cry
play on a pipe	cry hollo
trim with piping	encourage somebody by crying hollo
transport by pipeline