What is another word for tun?

There isn't really a direct synonym for "tun," as it is a rather archaic word. However, depending on the context, you could use some of these words:

* Barrel: This is the most common and straightforward alternative, especially when referring to a large container for liquids.

* Cask: This implies a smaller barrel, usually for storing wine or spirits.

* Hogshead: This is an older term for a large barrel, often used for wine or beer.

* Vat: This usually refers to a large container for fermenting liquids.

* Tank: This implies a large, usually industrial container for liquids or gases.

The best substitute for "tun" will depend on the specific context of its use.