Hair goos is a type of styling product used to hold hair in place. It is usually a GEL-like substance that is applied to the hair and then dried with a hairdryer. The term 'hair goos' is derived from the word 'GEL, ' which is a four-letter word that is one of the solutions to this crossword puzzle. Hair goos is often used to create a sleek, shiny look and can be used to add texture and volume to the hair.