The term 'RETINAL NERVE' is composed of two words: 'RETINAL' and 'NERVE'. The first word, 'RETINAL', is an adjective that refers to the retina, which is a light-sensitive layer of tissue at the back of the eye. The second word, 'NERVE', is a noun that refers to a bundle of fibers that transmits signals between the brain and other parts of the body. Together, the two words form the term 'RETINAL NERVE', which is a NERVE that connects the eye to the brain and is responsible for vision. The crossword solution for this term is 'OPTIC', which is an adjective that refers to the eye or vision.