EORI is an Economic Operator Registration and Identification. This is required if you are a person or trader carrying out custom activities in the EU. Newminster House, Bristol BS1 1LT Open 24/7 (+44) 01823 335666
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.
A ship is a large watercraft that travels the world's oceans and other sufficiently deep waterways, carrying passengers or goods, or in support of specialized missions, such as defense, research and fishing. Historically, a ship was a sailing vessel with at least three square-rigged masts and a full bowsprit.