What is part the speech for word excuse?

"Excuse" can be a few different parts of speech depending on how it's used in a sentence:

* Noun: This is the most common use. It refers to a reason given for doing something wrong or for failing to do something.

* Example: "He offered no excuse for his behavior."

* Verb: It can also be used as a verb, meaning to ask someone's pardon.

* Example: "Excuse me, could you pass the salt?"

* Interjection: It can be used as an interjection to express apology or to politely request someone to stop doing something.

* Example: "Excuse me! You're standing on my foot."

So, the specific part of speech depends on the context of the sentence.