Similar words
banheiro
Worth distinguishing: sanitário is just the toilet/restroom itself; banheiro is the whole bathroom.
Similar in other languages
Spanish
inodoro
inodoro is the Spanish word for the same thing — both mean "toilet."
Spanish
retrete
retrete is the Spanish word for the same thing — both mean "toilet."
Practice
1 What does sanitário mean?
toilet
2 Fill the gap: Vá ao ___.
Full sentence: Vá ao sanitário. (Go to the toilet.)
3 Which fingerprint chart matches sanitário?
sanitário: neutral register, common frequency, general domain, neutral connotation.