Ace' The term 'Top of the Class' can be summarized by the word 'ACE', which is a 5 letter word. An ACE is someone who excels in their field, and is often used to describe someone who is the best at what they do. It is also used to refer to someone who is highly skilled or knowledgeable in a particular subject. In the context of education, an ACE is someone who consistently achieves the highest grades in their class.