The term 'KIND OF CORTEX' can be solved by the word 'RENAL', which is a five-letter word. Renal cortex is a part of the kidney, which is responsible for filtering waste from the blood and producing urine. It is composed of two distinct layers, the outer renal cortex and the inner renal medulla. The renal cortex is made up of small tubes called nephrons, which are responsible for the filtration of waste from the blood.