Water duct and Water pipe

Water pipe and water duct are semantically related in conduit topic. In some cases you can use "Water pipe" instead a noun "Water duct".

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.

Water duct and water pipe are semantically related in conduit topic. You can use "Water duct" instead a noun phrase "Water pipe".