* Noun: This is the most common usage. "Blotches" refers to the marks themselves.
* Example: "The old painting was covered in dark blotches."
* Verb: While less common, "blotches" can be a verb meaning to mark with blotches.
* Example: "The rain blotched the freshly painted wall."
Let me know if you have a specific sentence in mind, and I can help you determine the part of speech more definitively.