flue pipe vs pipe

flue pipe and pipe both are nouns.

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

As nouns, pipe is a hypernym of flue pipe; that is, 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
pipe: the flues and stops on a pipe organ

Other hypernyms of flue pipe include organ pipe, pipework.

flue pipe (noun)	pipe (noun)
organ pipe whose tone is produced by air passing across the sharp edge of a fissure or lip	a long tube made of metal or plastic that is used to carry water or oil or gas etc.
	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