* Verb: This is the most common usage. Example: "Please select a color for your new car."
* Adjective: Meaning "chosen or considered to be the best." Example: "She was a select group of students invited to the conference."
* Noun: It can refer to a group of people or things that are chosen or considered the best. Example: "The select were invited to the exclusive party."
So, to determine the part of speech, you need to look at how it's used in the specific sentence!