Chimney and Flue pipe

Chimney 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.

Flue pipe and chimney are semantically related. In some cases you can use "Flue pipe" instead a noun "Chimney".

Flue pipe noun - Organ pipe whose tone is produced by air passing across the sharp edge of a fissure or lip.

Chimney and flue pipe are semantically related. You can use "Chimney" instead a noun phrase "Flue pipe".