What part of speech is the word required?

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

* Adjective: Describing something as necessary or essential.

* Example: "The required documents are missing."

* Verb (past participle): Used to express a necessity or obligation.

* Example: "The project required extensive research."

* Verb (past tense): Used to express something that was necessary or obligatory in the past.

* Example: "She required medical attention."

To determine the part of speech, you need to analyze its function in the specific sentence.