* Adverb: When used to emphasize or intensify another word, it's an adverb.
* Example: "That was a freaking amazing concert!"
* Interjection: When used as a standalone exclamation of surprise or anger, it's an interjection.
* Example: "Freaking! I forgot my keys!"
* Verb: In some cases, it can be a verb meaning "to cause to become frantic or agitated." This is less common.
* Example: "The news freaked her out."
It's important to look at the context to determine which part of speech it is.