flue vs organ pipe

flue and organ pipe both are nouns.

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

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

flue: 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 include pipe, pipework.

flue (noun)	organ pipe (noun)
a conduit to carry off smoke	the flues and stops on a pipe organ
organ pipe whose tone is produced by air passing across the sharp edge of a fissure or lip
flat bladelike projection on the arm of an anchor