The term 'sense organ' refers to the body parts that are responsible for detecting and responding to stimuli from the environment. The three most common sense organs are the EAR, NOSE, and RECEPTOR. The EAR is a three-letter word and is responsible for detecting sound waves. The RECEPTOR is an eight-letter word and is responsible for detecting changes in the environment such as temperature, light, and pressure. The NOSE is a four-letter word and is responsible for detecting smells. All of these sense organs work together to help us interact with our environment.