The term 'KING'S ENTERTAINER' refers to a person who is employed by a monarch to provide entertainment. This could include a FOOL or a JESTER, both of which are 4 and 6 letter words respectively. A FOOL is someone who acts foolishly or plays the FOOL for amusement, while a JESTER is a professional entertainer who performs jokes, skits, and other comedic acts. Both roles were popular in medieval courts and were often employed by kings and queens to provide entertainment.