The term 'round person' can be solved by the word 'BOXER', which is a five-letter word. A BOXER is a person who participates in the sport of boxing, which is a combat sport where two people fight using their fists. Boxers wear protective gloves and follow a set of rules and regulations. The objective of the sport is to land punches on the opponent and score points. The winner is usually determined by a referee or a judge.