Loo and Wash room

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

Wash room and loo are semantically related in bathroom topic. In some cases you can use "Wash room" instead a noun "Loo", when it comes to topics like washroom.

Wash room noun - A toilet that is available to the public.

Loo and wash room are semantically related in bathroom topic. Sometimes you can use "Loo" instead a noun phrase "Wash room", if it concerns topics such as washroom.