The term 'NICE EXTRA' can be broken down into two crossword solutions: BONUS (5 letters) and FILLIP (6 letters). BONUS is a term used to describe an additional benefit or reward given to someone for doing something, usually in the form of money or goods. A FILLIP is a small stimulus or encouragement that helps to motivate someone to do something. Together, these two words can be used to describe something that is an extra reward or incentive that is nice or pleasant.