"Lifeboatman" Natural Recordings by Native Speakers
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.
A lifebelt is a flotation device designed to keep a person afloat in water, typically worn around the chest or thrown to someone in distress.
Lifeblood is a noun that refers to something that is essential or vital to the success, prosperity, or well-being of a particular thing, organization, or system. It is often used to describe something that is crucial or fundamental to the functioning or survival of something else.