Knight titles are titles given to knights in the Middle Ages. The most common knight title is 'sirs', which is a four-letter word. This title is used to address a knight and is usually followed by their name. It is also used to refer to a knight in general, without specifying a particular individual. Other knight titles include 'LORD', 'BARON', 'EARL', and 'DUKE'. These titles are typically used to denote a higher rank among knights and are often associated with a certain area of land or a particular family.