What part of speech is worked?

"Worked" can be several parts of speech, depending on its context:

* Verb (past tense): "She worked hard on her project."

* Adjective: "He has a worked-out plan." (This is less common but still possible.)

* Participle (past): "The worked-out metal was still hot."

To determine the correct part of speech, you need to look at how "worked" is used in the sentence.