What is another name for witch hat?

There isn't really another common name for a witch hat, as it's quite distinct in its design. However, you could use more descriptive terms like:

* Conical hat

* Pointed hat

* Tall hat

* Wizard hat (though this can be a bit ambiguous, as wizards can wear different styles of hats)

* Halloween hat (if the context is clear)

Ultimately, the best alternative depends on the specific situation and what you are trying to convey.