flue pipe vs organ pipe

flue pipe and organ pipe both are nouns.

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

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

flue pipe: organ pipe whose tone is produced by air passing across the sharp edge of a fissure or lip
organ pipe: the flues and stops on a pipe organ

Other hypernyms of flue pipe include pipe, pipework.

flue pipe (noun)	organ pipe (noun)
organ pipe whose tone is produced by air passing across the sharp edge of a fissure or lip	the flues and stops on a pipe organ