organ pipe vs pipework

organ pipe and pipework both are nouns.

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

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

Other synonyms of organ pipe include pipe.

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