* Noun: A curse is something that brings bad luck or misfortune.
* Example: "The witch put a curse on the village."
* Verb: To curse is to wish bad luck or misfortune upon someone or something.
* Example: "The angry man cursed the driver who cut him off."
* Adjective: While less common, "curse" can be an adjective meaning "relating to a curse" or "characterized by a curse".
* Example: "The curse word was written in a dark, curse script."
So, without more context, it's impossible to say for sure what part of speech "curse" is. You need to look at the sentence it's used in to figure out its function.