W.C. is an acronym that stands for 'Water Closet' and is used to refer to a room containing a TOILET. The crossword solutions for W.C. are JOHN (4 letters), LAV (3 letters), TOILET (6 letters), and LOO (3 letters). JOHN is a common name, but it can also be used as a slang term for a TOILET. LAV is short for lavatory, which is another word for a bathroom or restroom. TOILET is the most common word used to refer to a room with a TOILET. Lastly, LOO is a British slang term for a TOILET.