Major success is a term used to describe a great accomplishment or achievement. It can be achieved through hard work and dedication. In this crossword, the solutions SMASH (5 letters), HIT (3 letters) and COUP (4 letters) all refer to major successes. SMASH implies a great victory or triumph, HIT suggests a successful outcome, and COUP implies a successful surprise attack or maneuver. All three words are indicative of a major success.