A breathing aid is a device used to help a person breathe more easily. An AIRHOLE, with seven letters, is a small opening that allows air to pass through. An inhaler, also with seven letters, is a device used to deliver medication directly into the lungs. SCUBA, with five letters, stands for Self-Contained Underwater Breathing Apparatus and is used by divers to breathe underwater. A RESPIRATOR, with ten letters, is a device that filters out harmful particles from the air. A GILL, with four letters, is an organ used by some aquatic animals to extract oxygen from water. An ironlung, with eight letters, is a machine used to help people with severe lung diseases breathe. A reirator, with eight letters, is a device used to humidify and filter air. An oxygenmask, with ten letters, is a device used to deliver oxygen to a person's nose and mouth.