Hair balls, also known as trichobezoars, are clumps of hair that form in the stomachs of animals, such as cats, due to excessive grooming. The term 'topknots' is an 8-letter solution to a crossword puzzle and refers to a hairstyle in which the hair is tied up in a knot at the top of the head. This hairstyle is often seen in traditional Japanese culture and is also popular among some modern fashion trends.