flue vs labial pipe

flue and labial pipe both are nouns.

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

As nouns, flue and labial pipe are synonyms defined as:

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

Other synonyms of flue include flue pipe.

flue (noun)	labial pipe (noun)
a conduit to carry off smoke	organ pipe whose tone is produced by air passing across the sharp edge of a fissure or lip
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