What part of speech is the word whole?

The word "whole" can be several parts of speech depending on its use in a sentence:

* Adjective: Describing something as complete or entire.

* Example: "The whole cake was eaten."

* Noun: Referencing the entire quantity or entity.

* Example: "The whole of the city was illuminated."

* Pronoun: Standing in for a previously mentioned noun, meaning the entire amount.

* Example: "I ate the whole thing."

It's important to look at the context to determine which part of speech "whole" is functioning as.