What part of speech is rested?

"Rested" can be two different parts of speech depending on its use in a sentence:

* Adjective: Describing a state of being well-rested. Example: "After a long night's sleep, I felt rested."

* Past participle of the verb "to rest": Used to form verb tenses or as an adjective. Example: "I have rested my feet after a long hike." or "I have a rested look on my face."