waste pipe vs pipe

waste pipe and pipe both are nouns.

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

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

waste pipe: a pipe through which liquid is carried away
pipe: a long tube made of metal or plastic that is used to carry water or oil or gas etc.

Other hypernyms of waste pipe include pipage, piping.

waste pipe (noun)	pipe (noun)
a pipe through which liquid is carried away	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