What part of speech is struggle?

"Struggle" can be a few different parts of speech depending on its use in a sentence:

* Noun: When it refers to the act of making a great effort to achieve something difficult.

* Example: "Their struggle to climb the mountain was long and arduous."

* Verb: When it describes the act of making a great effort to achieve something difficult.

* Example: "They struggled to understand the complex instructions."

* Adjective: Used to describe something difficult or laborious.

* Example: "The struggle for independence was a long and difficult one."

So, the part of speech of "struggle" depends on its role within the sentence.