What part of speech is curiousity?

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

* Noun: This is the most common usage. For example: "Her curiosity got the better of her."

* Adjective: It can also describe a person or thing. For example: "He was a curious child."

* Verb: Less common, but it can be used as a verb, meaning to be interested in something. For example: "She curioused about the new exhibit."

Therefore, you'll need more context to definitively determine the part of speech of "curiosity."