What part of speech is the word ash?

The word "ash" can be several parts of speech depending on its context:

* Noun: This is the most common use, referring to the powdery residue left after something burns.

* "The fireplace was filled with ash."

* Verb: It can mean to reduce to ashes, or to cover with ashes.

* "They ashed the old documents."

* Adjective: It can be used to describe something that is ash-colored.

* "She wore an ash-grey dress."

So, without context, it's difficult to definitively say what part of speech "ash" is.