Aqueduct and Water pipe

Aqueduct noun - An open man-made passageway for water.

Water pipe and aqueduct are semantically related in conduit topic. In some cases you can use "Water pipe" instead a noun "Aqueduct", when it comes to topics like waterline, water main.

Water pipe noun - An oriental tobacco pipe with a long flexible tube connected to a container where the smoke is cooled by passing through water.

Aqueduct and water pipe are semantically related in conduit topic. Sometimes you can use "Aqueduct" instead a noun phrase "Water pipe", if it concerns topics such as waterline, water main.