Fine distinction is a phrase used to describe a subtle difference between two things. It can refer to a small but meaningful difference in quality, meaning, or degree. NUANCE, a 6-letter word, is a subtle difference in meaning, expression, or sound. NICETY, another 6-letter word, is a small detail or distinction that is often overlooked. SUBTLETY, an 8-letter word, is the quality of being difficult to detect or describe, often because it is so slight. All three words are used to describe the concept of fine distinction.