Labial pipe and Organ pipe

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

Organ pipe and labial pipe are semantically related. In some cases you can use "Organ pipe" instead a noun phrase "Labial pipe".

Organ pipe noun - The flues and stops on a pipe organ.

Labial pipe and organ pipe are semantically related. Sometimes you can replace phrase "Labial pipe" with "Organ pipe", this phrases are similar.