Thesaurus:bathroom

• bathroom (US; particularly, a private one)^[a]
• latrine (military or makeshift connotation)
• necessarium (humorous)
• toilet    [⇒ thesaurus]
• toilet room (dated)
• urinal
• water closet (UK)
• WC (UK)

(obsolete)

• cloaca
• closet
• jacques
• kocay
• siege

• cludgie (Scotland, chiefly Glaswegian)
• neddy (Geordie, obsolete)
• netty (Geordie)
• shield (Scotland, obsolete)
• six (North Wales)

• facilities
• ladies and gentlemen (rare)
• lavatory
• lavabo (jocular slang)
• necessary
• necessary room
• office (archaic)
• office of ease
• place
• potty (childish)
• privy (dated)
• small room
• smallest room
• throne room (jocular slang)

(UK)

• cottage (gay slang)
• geography (upper-class euphemism)
• House of Lords (jocular, dated)
• khazi (originally Cockney, now Liverpudlian)
• usual offices

(US)

• restroom    [⇒ thesaurus]
• teahouse (gay slang, dated)
• tearoom (gay slang, dated)
• washroom (also used in Canada)

(obsolete)

• closet of decency
• closet of ease
• house of office
• necessary place
• purging place
• vault
• withdraught
• wardrobe

• shitter (vulgar)
• urination station

(UK)

• bog (vulgar)
• carsey
• crapper (vulgar)
• karzy
• lats
• lav
• lavvy
• loo
• thunderbox (also in Australia)

(US)

• can
• john
• johnny (dated)

(Australia)

• bogger
• brasco
• dike (also in New Zealand)
• dunny (also in New Zealand)

(Ireland)

• jacks
• jakes

• gents' (uncommon)
• man's room (nonstandard)
• men's
• men's room

(dated)

• Gentlemen's
• gentlemen's
• gentlemen's room

(UK)

• cloakroom
• gents

(childish)

• little boys room
• little boy's room (nonstandard)
• little boys' room

• ladies (UK)
• ladies'
• ladies' cloakroom (obsolete)
• ladies' room
• powder room
• woman's room (nonstandard)
• women's room (US)

(childish)

• little girls room
• little girl's room (nonstandard)
• little girls' room

(Commonwealth)

• cloakroom
• toilet    [⇒ thesaurus]

(US)

• half bath
• half bathroom
• powder room

• portable    [⇒ thesaurus]
• portable toilet
• porta-kybo
• portalet
• porta-potty
• port-a-san
• port-o-let
• sani-privy

(UK)

• portaloo
• turdis

(US)

• johnny house (slang)
• port-a-john
• port-o-john

• chemical closet
• dike (Australia, New Zealand, slang)
• head    [⇒ thesaurus]
• latrine
• necessarium
• reredorter
• trap (slang)

(UK)

• convenience
• public convenience

(US)

• comfort station
• full bath
• full bathroom
• three-quarter bath
• three-quarter bathroom

(Philippines)

• comfort room
• CR

(obsolete)

• gongpit
• urinal

• outbuilding
• outhouse    [⇒ thesaurus] (dated)
• room    [⇒ thesaurus]

• toilet    [⇒ thesaurus]
• washbasin    [⇒ thesaurus]

• abode    [⇒ thesaurus]
• café    [⇒ thesaurus]
• factory
• hospital
• lodging place    [⇒ thesaurus]
• office    [⇒ thesaurus]
• prison    [⇒ thesaurus]
• pub    [⇒ thesaurus]
• restaurant    [⇒ thesaurus]
• retail store    [⇒ thesaurus]
• school    [⇒ thesaurus]