Boofhead is a colloquial term widely used in Australia and New Zealand to refer to someone who is silly or stupid. However, there are various other synonyms for this term, such as buffoon, goofball, nincompoop, halfwit, dummy, blockhead, and dolt. These words can be used synonymously to replace boofhead in a sentence or conversation. Each term carries a slightly different connotation and may be more or less appropriate in various situations. Regardless of which term one uses, it's always best to avoid using derogatory language and be respectful towards others.