flue pipe vs labial pipe

flue pipe and labial pipe both are nouns.

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

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

flue pipe 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 pipe include flue.

flue pipe (noun)	labial pipe (noun)
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