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Vessel is a catch-all term, like 'watercraft', which describes any floating object used for the carriage of people or goods. Generally smaller and less complex vessels are 'boats', whilst larger and more complex vessels are 'ships'. As a general rule, you can put a boat on a ship, but you can't put a ship on a boat.
He defines a vessel as a person and it is also common language in the dictionary and the Bible. Vessel is defined in the US Code at 1 USC 3. Black's Law Dictionary 8th Addition says the definition of vessel is very broad. The standard dictionary defines vessel as a person as an agent or holder of something.