The term 'smelling organ' refers to the NOSE, which is a four-letter word. The NOSE is an organ located on the face that is responsible for detecting smells. It is also involved in breathing, and it helps to filter out dust and other particles from the air we breathe. The NOSE is made up of two nostrils, which are connected to the nasal cavity. Inside the nasal cavity are tiny hairs called cilia, which help to trap particles and keep them from entering the lungs. The NOSE is also connected to the olfactory bulb, which is responsible for sending signals to the brain that allow us to recognize different smells.