What part of speech is sweetheart?

"Sweetheart" can be a few different parts of speech, depending on its context:

* Noun: It can refer to a loved one, usually a romantic partner.

* Example: "My sweetheart is coming to visit."

* Interjection: It can be used as a term of endearment.

* Example: "Oh, sweetheart, you're so silly!"

* Adjective: While less common, it can sometimes be used as an adjective meaning "charming" or "endearing."

* Example: "She had a sweetheart smile."

So, the specific part of speech depends on how it's used in a sentence!