cloaca vs waste pipe

cloaca and waste pipe both are nouns.

Word	Noun	Adjective	Verb	Adverb
cloaca	Yes	No	No	No
waste pipe	Yes	No	No	No

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

Other hypernyms of cloaca include drain, drainpipe.

cloaca (noun)	waste pipe (noun)
a waste pipe that carries away sewage or surface water	a pipe through which liquid is carried away
(zoology) the cavity (in birds, reptiles, amphibians, most fish, and monotremes but not other mammals) at the end of the digestive tract into which the intestinal, genital, and urinary tracts open