What do you call a word that stands for sound such as BANG?

There isn't one specific, universally accepted term for a word that stands for a sound like "BANG". However, here are some terms that could be used, depending on the context:

* Onomatopoeia: This is the most common and accurate term. It refers to the formation of a word from a sound associated with what it describes.

* Sound word: This is a more general term that can be used to describe any word that represents a sound.

* Sound effect: This term is often used in the context of media, such as film or video games, to describe a sound that is added to enhance the experience.

* Sound symbol: This term emphasizes the symbolic nature of the word and its ability to evoke the sound it represents.

* Mimetic word: This term is less common but can be used to describe a word that imitates a sound.

The best term to use will depend on the specific context and the emphasis you want to place on the word.