The crossword solution for the term BOXER SONNY is LISTON, a six-letter word. Sonny Liston was an American professional boxer who competed from 1953 to 1970. He was known for his intimidating appearance and powerful punching style. He held the world heavyweight championship twice, first in 1962 and then again in 1964. Liston was widely regarded as one of the most formidable and feared boxers of all time.