What's a reception room/parlor/parlour/ drawing room?
I'm thinking, is it just another word for the living room of my house?
Reception room is the room of a hotel (but it could be other buildings too) used for parties and meetings.
In the UK, a Reception room is a stock phrase used by estate agents (realtors) and the like in property descriptions.
Basically it means any reasonable-sized room downstairs available to receive a visitor in. Specifically excluding kitchens and dining rooms, plus other rooms plainly unsuitable, such as a cloakroom (downstairs toilet).
Most houses only have one, so it's normally only mentioned if the property is up-market enough to have two or more. In many such homes that I've been familiar with, one of the two (usually the one at the front) is kept far more tidy, and is rarely used as 'living space' by the occupants except when they actually do have visitors.
Hotels sometimes refer to reception rooms, but confusion with the main reception area/concourse means they tend to call them meeting/conference/dining/banqueting rooms/halls.