What part of speech is darkness?

"Darkness" can be either a noun or an adjective, depending on how it's used in a sentence.

Here's how:

Noun:

* "The darkness was so thick, you could cut it with a knife." (Darkness is the subject of the sentence.)

* "She was afraid of the darkness." (Darkness is the object of the preposition "of".)

Adjective:

* "The room was dark." (Dark describes the room.)

* "He wore dark clothes." (Dark describes the clothes.)

Let me know if you'd like examples of how "darkness" is used in a sentence!