Basin and Millpond

Basin noun - A bowl-shaped vessel; usually used for holding food or liquids.

Millpond and basin are semantically related In some cases you can use "Millpond" instead a noun "Basin".

Millpond noun - A pond formed by damming a stream to provide a head of water to turn a mill wheel.

Basin and millpond are semantically related in collection of liquid topic. You can use "Basin" instead a noun "Millpond", if it concerns topics such as small body of water, inland body of water.