Here's why:
* Adverbs describe verbs, adjectives, or other adverbs. They tell us how, when, where, or to what extent something happens.
* "Silently" modifies a verb by indicating the manner in which an action is performed (e.g., "He walked silently down the street").
Example:
* Verb: "He walked."
* Adverb: "Silently" modifies the verb "walked" to tell us *how* he walked.
Let me know if you have any other word you want to categorize!