What part of speech is star?

"Star" can be a few different parts of speech depending on how it's used:

* Noun: This is the most common use. It refers to the celestial object.

* Example: "The star shone brightly in the night sky."

* Verb: It can mean to play the leading role in a play or film.

* Example: "She starred in the Broadway production."

* Adjective: It can be used to describe something that is outstanding or excellent.

* Example: "He's a star athlete."

So, to know the part of speech of "star" in a sentence, you have to look at how it's used in context.