"Lifejacket" Natural Recordings by Native Speakers
A lifejacket is a device designed to keep a person afloat in water in the event of emergency, typically worn on the upper body. It is also known as a personal flotation device (PFD).
A lifeboatman is a person who mans a lifeboat, which is a small boat designed to rescue people from a ship or vessel that is in danger of sinking or is already sinking.