Virtual Lavatory  
By any other name...
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The water closet is known by an amazing number of names. Social qualms and prejudice have led to bodily functions and the tools to perform them being disguised under layers of euphemism, whilst dialect and slang add to the confusion.

Being specific, 'water closet' refers to the room in which a loo is found, whilst 'lavatory' actually means a wash basin (from the latin lavare) and 'toilet' means the appearance (as in toilet water, toilet bag etc.). So there's plenty of room for pedantry in the smallest room.

Here are some of the miriad of terms used to mean the WC, or the room in which it is found:

The ablutions, bathroom, board, bog, can, cloakroom, cloaks, close stool, closet, commode, (public) convenience, crapper, donek, dunny, EC, facilities, garderobe, gents, gozunder, heads, jakes, jap, jericho, jerry, john, khazi, ladies, latrine, lats, lavatory, lav, loo, necessary, netty [from the Italian gabinetto], No. 100, place of easement, the plumbing, po, porcelain pony, powder room, privy, proverbial (brick outhouse), restroom [america only], retiring room, s  t-house, shot tower, smallest room, throne, thunder-box, toilet, usual offices, washroom, water closet, WC and you-know-where.

And here are some phrases indicating the actions therein:

answer a call of nature, be excused, commune with nature, do one's business, drop Hitler a line, ease oneself, examine the plumbing, jimmy riddle, pay a call/visit, pluck a daisy, point percy at the porcelain, powder one's nose, relieve oneself, see a man about a dog, see the geography of the house, shake hands with a friend, shed a tear, slash, strain the greens, spend a penny, talk into the big white telephone, tiddle, tom tit, wash one's hands, wring a kidney.