A queen consort is the wife of a king. Usually the husband of a queen regnant is not known as king. In the United Kingdom, the term prince consort has been used.
A queen dowager is a woman who was queen consort but whose husband has died or abdicated, someone else having become monarch.
A queen mother is a queen dowager whose child, having succeeded his or her father, is now the monarch.
Other
The queen is the most powerful piece in the game of chess.
This is a disambiguation page; that is, one that just points to other pages that might otherwise have the same name. If you followed a link here, you might want to go back and fix that link to point to the appropriate specific page.