Here's why:
* Verbs describe actions or states of being. "Shriek" describes the act of making a high-pitched, piercing sound.
* Adverbs modify verbs, adjectives, or other adverbs, telling us how, when, where, or to what extent something is done.
Example:
* Verb: The child shrieked in terror.
* Adverb: The child shrieked loudly in terror. ("Loudly" modifies the verb "shrieked")
Let me know if you'd like to know more about adverbs or verbs!