Restroom and Sauna

Restroom noun - A room furnished with a fixture for flushing body waste.

Sauna and restroom are semantically related in room for bathing topic. In some cases you can use "Sauna" instead a noun "Restroom", when it comes to topics like toilet use.

Sauna noun - A Finnish steam bath; steam is produced by pouring water over heated rocks.

Restroom and sauna are semantically related in room for bathing topic. You can use "Restroom" instead a noun "Sauna", if it concerns topics such as toilet use.