The term 'having the shape of a WORM' can be described as vermiform, which is a nine-letter word. Vermiform is an adjective that describes something that has the shape of a WORM. It is derived from the Latin word 'vermis, ' which means 'WORM.' This term is often used to describe certain types of bacteria, such as the spiral-shaped bacteria known as spirochetes. It can also be used to describe certain types of animals, such as the earthworm.