Steam pipe and Water pipe

Steam pipe noun - A pipe conducting steam.

Water pipe and steam pipe are semantically related In some cases you can replace phrase "Water pipe" with "Steam pipe", this phrases are similar.

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.

Steam pipe and water pipe are semantically related in pipe through which water moves topic. You can use "Steam pipe" instead a noun phrase "Water pipe".