The term 'wheel inventor' can be summarized by two crossword solutions: Ferris (6 letters) and Galeferrris (10 letters). George Washington Gale Ferris Jr. was an American engineer who designed and constructed the original Ferris Wheel for the 1893 World's Columbian Exposition in Chicago. The wheel was a major attraction at the fair and was the first of its kind. Ferris' invention revolutionized the amusement park industry and is still popular today.