BUILDING[C]›a building where people live, usually one family or group: a three-bedroomed houseWe went to my aunt's house for dinner.
PEOPLE[no plural]›the people who live in a house: The baby's screaming woke the whole house up.
PLACE FOR ACTIVITY[C]›the place where a particular business or activity happens: an opera housea publishing house
the House›a group of people which makes a country's laws, or the place where they meet: the House of Commons/RepresentativesThe House voted on the proposals.
THEATRE[C]›the people watching a performance or the area where they sit: [usually singular]The actors played to a full house.