What part of speech is the word hard?

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

* Adjective: Describing a quality or characteristic.

* Example: "The test was hard."

* Adverb: Modifying a verb, adjective, or another adverb.

* Example: "She worked hard on the project."

* Noun: Referring to a solid, unyielding substance.

* Example: "The rock was made of hard."

Let me know if you have a specific sentence you'd like me to analyze!