Bathtub and Cistern

Bathtub noun - A relatively large open container that you fill with water and use to wash the body.

Cistern and bathtub are semantically related. In some cases you can use "Cistern" instead a noun "Bathtub".

Cistern noun - A sac or cavity containing fluid especially lymph or cerebrospinal fluid.

Bathtub and cistern are semantically related. You can use "Bathtub" instead a noun "Cistern".