For a container:
* Container: A general term for something that holds something else.
* Crate: A large box, often made of wood.
* Jar: A glass container with a wide mouth, usually for food.
* Tank: A large, usually metal container for liquids.
* Cask: A barrel-shaped container for liquids, typically wine or beer.
For a ship:
* Ship: This is a more general term, but can be used interchangeably with "vessel" in many cases.
* Boat: A smaller watercraft.
* Craft: This is a more formal term, often used in nautical contexts.
* Barge: A flat-bottomed boat used for transporting goods.
* Yacht: A luxury sailboat.
For a blood vessel:
* Artery: A blood vessel that carries blood away from the heart.
* Vein: A blood vessel that carries blood back to the heart.
* Capillary: A tiny blood vessel that connects arteries and veins.
Other possible synonyms:
* Receptacle: Something that holds something else.
* Carrier: Something that transports something else.
* Conduit: A channel or passage for something to flow through.
It's important to consider the specific context when choosing a synonym for "vessel."