What part of speech is the word last?

The word "last" can be a few different parts of speech, depending on how it's used in a sentence:

* Adjective: Describing something as being the final one in a series or sequence.

* Example: "This is the last chapter of the book."

* Adverb: Indicating the most recent time or instance.

* Example: "I last saw her yesterday."

* Noun: Referring to the final part of something.

* Example: "They're all gone, except for the last."

To figure out the correct part of speech, you need to look at the sentence and see how the word is functioning.