En-suite literally means “in the room”, but now the combined word usually refers to a bathroom that is directly connected to a room. Most often an ensuite is connected to the master bedroom. En suites are thought of as private washrooms, and are never built off of common areas like hallways.

What is the difference between a bathroom and ensuite?

As nouns the difference between bathroom and ensuite is that bathroom is a room containing a bath where one can bathe while ensuite is a bathroom connected to a bedroom; a private bathroom (as opposed to a shared, public bathroom).

What is the difference between an en suite and a master suite?

When people use the word today, they mean a bathroom that is directly connected. So, today an ensuite bath and master bath have the same meaning. If there are two bathrooms on the second floor, almost always one of them is an en-suite bathroom part of a master suite.