What part of speech is the word worn?

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

* Past participle of the verb "wear": In this case, it acts as an adjective describing something that has been worn, such as "worn shoes" or "a worn-out sweater."

* Past participle used as an adjective: It can also be used as an adjective on its own, describing something that has the characteristic of being worn, such as "a worn look" or "a worn expression."

Let me know the sentence you're considering, and I can tell you definitively which part of speech "worn" is acting as.