Bonce is a colloquial term for the head, mostly used in British English. However, there are several other synonyms for bonce that can be used in different contexts. Some of these synonyms are skull, cranium, dome, noggin, melon, bean, and pate. These words are used to refer to the head with a playful or casual tone. The usage of these synonyms is dependent on the context. For instance, pate is often used in a more formal context, while bean and noggin are casual and playful. The usage of synonyms adds a dynamic quality to the language and makes it more fun and versatile.