The term 'Good Loser' can be broken down into three crossword solutions: SPORT (5 letters), DIETER (6 letters), and RUNNERUP (8 letters). SPORT is an activity that involves physical exertion and skill in which an individual or team competes against another or others for entertainment. DIETER is a person who follows a diet, especially to lose weight. RUNNERUP is a person or thing that finishes second in a competition or race. Taken together, these three solutions form the phrase 'Good Loser, ' which is used to describe someone who is gracious and humble in defeat.