pipe vs organ pipe

pipe and organ pipe both are nouns.

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

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

Other synonyms of pipe include pipework.

pipe (noun)	organ pipe (noun)
a long tube made of metal or plastic that is used to carry water or oil or gas etc.	the flues and stops on a pipe organ
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