The crossword solution for the term 'O'Neill Title Word' is 'ICEMAN', which is a six-letter word. The term is a reference to Eugene O'Neill's play 'The Iceman Cometh', which was first performed in 1946. The play follows the story of a group of down-and-out alcoholics in a bar in New York City, and their interactions with a mysterious salesman. The play is considered one of O'Neill's greatest works, and has been adapted into several films and television shows.