* Verb: This is the most common use. It means to be cautious or watchful for danger.
* Example: Beware of the dog!
* Interjection: This is used to express warning or caution.
* Example: Beware! The bridge is out.
* Noun: While less common, it can be used as a noun meaning a warning or a caution.
* Example: He ignored the beware signs.
So, without context, it's hard to definitively say which part of speech "beware" is.