What do you call the British Parliament's upper house?

The British Parliament’s upper house is called the House of Lords. This body plays a crucial role in the legislative process, reviewing legislation proposed by the House of Commons, which is the lower house. The House of Lords consists of appointed members, including life peers, bishops, and hereditary peers, and it functions to provide expertise, debate complex issues, and act as a check on the Commons.

The House of Lords is distinct from the House of Commons, where Members of Parliament (MPs) are elected by the public. The other options, such as the House of Representatives and House of Parliament, do not pertain to the structure of the UK Parliament; rather, they refer to bodies in other countries, specifically the United States. The term "House of Parliament" typically refers to the entire building where both houses meet, rather than specifically indicating the upper house.