Powder room and Sauna

Powder room noun - A woman's restroom in a public (or semipublic) building.

Sauna and powder room are semantically related In some cases you can use "Sauna" instead a noun phrase "Powder room".

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

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