* Noun: This is the most common usage, meaning "trash" or "nonsense."
* Example: "Don't throw your rubbish on the floor."
* Example: "He's talking absolute rubbish."
* Adjective: Meaning "worthless" or "of poor quality."
* Example: "That was a rubbish movie."
* Verb: Meaning "to discard" or "to remove." This usage is less common.
* Example: "They rubbedished the old furniture."
So, the specific part of speech depends on its function in a sentence.