What part of speech is the word undercover?

"Undercover" can be a few different parts of speech, depending on how it's used in a sentence:

* Adjective: This is the most common usage. It describes something that is done secretly or without being noticed.

* Example: "The detective went undercover to gather evidence."

* Adverb: This usage modifies a verb, describing how an action is performed.

* Example: "The witness went undercover to protect their identity."

* Noun: This is less common, but it can refer to the state of being undercover.

* Example: "The undercover operation was a success."

To determine the part of speech, consider its role in the sentence and how it relates to other words.