* Verb (past participle): This is the most common use. It means to see or notice something, often unexpectedly. For example: "I spotted a deer in the woods."
* Adjective: This means marked with spots. For example: "The dog has a spotted coat."
* Noun: This is less common, but can be used to refer to a spot or blemish. For example: "There's a spotted on my shirt."
To determine the part of speech, you need to look at its role in the sentence.