The term 'distinguishing quality' can be defined as a TRAIT that sets someone or something apart from others. It is a characteristic that makes them unique and stands out from the rest. A five letter word for this concept is 'TRAIT'. Traits are often used to describe people, such as their personality, physical characteristics, or behavior. They can also be used to describe objects, such as the color, shape, or texture of an item. Distinguishing qualities are important in helping to identify and differentiate between individuals and objects.