The term 'HOOP ATTACHMENT' can be solved by the three-letter word 'NET'. A NET is a type of mesh material that is used to attach to a hoop, such as a basketball hoop. It is usually made of strong and durable materials such as nylon or polyester, and is designed to catch the ball when it is shot into the hoop. Nets are also used in other sports, such as volleyball and soccer, to help keep the ball in play.