What is the slang term for word head?

There isn't a widely recognized slang term for "word head" in the way you might be thinking. The phrase "word head" doesn't typically appear in everyday slang.

It's possible you're misremembering or mishearing a phrase, or perhaps it's a regional slang term.

To help clarify, could you provide some context about how you heard the term "word head" used? This would help me understand your intended meaning and provide a more accurate response.