What part of speech is they word least?

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

* Adjective: Describes a noun, indicating the smallest amount or degree.

* Example: "The least expensive option is the best for me."

* Adverb: Modifies a verb, adjective, or another adverb, indicating the smallest extent or degree.

* Example: "I least expected to see you here."

* Pronoun: Can be used as the object of a preposition, meaning "the smallest amount" or "the smallest number."

* Example: "Of all the choices, I like this one the least."

To determine the specific part of speech of "least" in a sentence, you need to look at how it is used and what it modifies.