What part of speech is the word darling?

The word "darling" can be several parts of speech, depending on its context:

* Noun: Used to address a loved one, often as a term of endearment. Example: "My darling, you look beautiful."

* Adjective: Describing something as beloved or cherished. Example: "That's my darling cat."

* Interjection: Expressing affection or surprise. Example: "Darling, you're home early!"

So, the part of speech of "darling" depends on how it's used in a sentence.