pipework vs reed pipe

pipework and reed pipe both are nouns.

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

As nouns, reed pipe is a hyponym of pipework; that is, reed pipe is a word with a more specific, narrower meaning than pipework:

Other hyponyms of pipework include flue, flue pipe, labial pipe, organ stop.

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