* Noun: A sudden and violent disturbance or upset.
* Example: "The news of her death came as a shock to everyone."
* Verb: To affect suddenly and strongly with surprise, fear, or dismay.
* Example: "I was shocked by the amount of damage."
* Adjective: Characterized by or causing sudden and intense surprise, fear, or dismay.
* Example: "The doctor gave me a shock diagnosis."
So, the part of speech of "shock" depends on its context in the sentence.