chimney vs flue

chimney and flue both are nouns.

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

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

chimney: a vertical flue that provides a path through which smoke from a fire is carried away through the wall or roof of a building
flue: a conduit to carry off smoke

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

chimney (noun)	flue (noun)
a vertical flue that provides a path through which smoke from a fire is carried away through the wall or roof of a building	a conduit to carry off smoke
a glass flue surrounding the wick of an oil lamp	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