The crossword solution for the term 'State Founder William' is Penn, which is a four-letter word. William Penn was an English Quaker and founder of the Province of Pennsylvania, the British North American colony that became the U.S. state of Pennsylvania. He was an early champion of democracy and religious freedom, notable for his good relations and successful treaties with the Lenape Native Americans. Penn founded the city of Philadelphia and was one of the original organizers of the Pennsylvania Colony.