What part of speech is the word final?

The word "final" can be several parts of speech depending on its context:

* Adjective: Describing something that is the last or ultimate in a series. Example: "This is the final exam."

* Noun: Referring to the last stage or event in a series. Example: "We're waiting for the final."

* Adverb: Modifying a verb or adjective to indicate something is conclusive or definitive. Example: "The decision is final."

To determine the correct part of speech, you need to consider the sentence and the role of the word within it.