steam pipe vs pipe

steam pipe and pipe both are nouns.

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

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

steam pipe: a pipe conducting steam
pipe: a long tube made of metal or plastic that is used to carry water or oil or gas etc.

Other hypernyms of steam pipe include pipage, piping.

steam pipe (noun)	pipe (noun)
a pipe conducting steam	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