The term 'car seat attachment' refers to two components that are used to secure a car seat in place. The first component is the headrest, which is an 8-letter word. It is a padded support that is attached to the top of the car seat and helps to protect the occupant's head and neck in the event of a collision. The second component is the STRAP, which is a 5-letter word. It is a belt or harness that is used to secure the car seat to the vehicle, ensuring that it stays in place during travel.