Similar words
toilette
Worth distinguishing: toilette is just the toilet/restroom itself; salle de bain is the whole bathroom, which may also include a bathtub or shower.
Similar in other languages
German
Badezimmer
Badezimmer is the German word for the same thing — both mean "bathroom."
Portuguese
banheiro
banheiro is the Portuguese word for the same thing — both mean "bathroom."
Practice
1 What does salle-de-bain mean?
bathroom
2 Fill the gap: La ___-de-bain est au premier étage.
Full sentence: La salle-de-bain est au premier étage. (The bathroom is on the first floor.)
3 Which fingerprint chart matches salle-de-bain?
salle-de-bain: neutral register, core frequency, general domain, neutral connotation.