Queen
A Queen Consort is a queen who is not a monarch, but is married to one, such as a King. Camilla is a Queen Consort. However, the husband of a queen is not always called a king. For example, King George VI had a wife, who was called Queen Elizabeth. He had no sons, so he was followed by his elder daughter, who was also called Elizabeth. She became Queen Elizabeth II. She was married to The Duke of Edinburgh until his death on April 9, 2021; but when she became Queen he did not become King. This is because the title "King Consort" does not exist.