Either. Depends on the situation. Restroom is more formal (such as in a restaurant) but really there is no difference.
add In NZ, the 'bathroom' euphemism seems slightly curious - in this country a bathroom would have a bath in it. And not necessarily a WC/toilet bowl.
In a NZ restaurant I'd ask for the toilet. But obviously, it is a cultural convention and differs across countries.
It is a Bathroom or a Toilet.
Another word for a large restroom is "bathroom". A bathroom is a room containing a bath or shower. This, however, can be confused with the toilet.
Bathroom is one word. An example sentence would be "the bathroom is painted turquoise.
Bathroom, restroom, toilet.
You just said it. British people speak English too. --------------------------------------------------------------------------- they also say loo / toilet/ WC
You could say, 'The bathroom is over there.': El baño está allá.
restroom, John, Head, Powder Room. Loo.
To go to the bathroom/restroom.
The average person uses the bathroom/ restroom about 3 times a day.
Typically I go to the restroom and relieve myself.
they pick a hole to go to the bathroom in!
You will know when a cat has to go to the bathroom because it will relieve itself. It is unlikely that a cat would actually use a restroom.