The crossword solution for the term 'KIND OF GORILLA' is 'BACK', which is a four letter word. The term 'BACK' refers to the species of gorilla known as the Eastern Lowland Gorilla, which is also known as Grauer's Gorilla. This species of gorilla is native to the eastern Democratic Republic of Congo and is the largest of the four gorilla subspecies. It is distinguished by its stocky body, large hands, and short muzzle.