Bedroom is a private room where people usually sleep for the night or relax during the day.
Bathroom is a room that may have different functions depending on the culturalist context. In the most literal sense, the word bathroom means “a room with a bath”. Because the traditional bathtubs have partly made way for modern showers, including steam showers, the more general definition is “a room where one bathes“. There can be just a shower, just a bathtub or both; and often both plumbing fixtures are combined in the bathtub. The room may also contain a sink, often called a “wash basin” or “hand basin” (in parts of the USA) and often a “lavatory“.
Living room, also known as sitting room, lounge room or lounge (in the United Kingdom and Australia), is a room for entertaining guests, reading, watching TV or other activities. The term front room can also be used to describe a living room, because in many homes the living room is at the very front.
Dining room is a room for consuming food. In modern times it is usually adjacent to the kitchen for convenience in serving, although in medieval times it was often on an entirely different floor level. Historically the dining room is furnished with a rather large dining table and a number of dining chairs; the most common table shape is generally rectangular with two armed end chairs and an even number of un-armed side chairs along the long sides.