organ pipe vs pipe

organ pipe and pipe both are nouns.

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

As nouns, organ pipe and pipe are synonyms defined as:

Other synonyms of organ pipe include pipework.

organ pipe (noun)	pipe (noun)
the flues and stops on a pipe organ	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