What part of speech is shatter?

"Shatter" can be both a verb and a noun, depending on how it's used in a sentence.

Verb: When it describes an action, like breaking into pieces, it's a verb.

* Example: The glass vase shattered into a million pieces.

Noun: When it refers to the act of breaking or the sound of something breaking, it's a noun.

* Example: The shatter of the window startled everyone.

Let me know if you'd like some more examples!