Here are some others, though they might be less common or have more specific contexts:
* "Bean": Often used in phrases like "use your bean" or "give me a bean."
* "Head": Can refer to the brain in some contexts, but it's more likely to refer to the whole head.
* "Dome": This one is used when talking about the physical shape of the head.
* "Grey matter": This is more of a scientific term, but it can be used colloquially as well.
* "Thinking cap": This is a playful way to refer to the brain, implying that it's something you can put on and take off.
The best choice depends on the context and your desired tone.