What part of speech is go?

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

* Verb: This is the most common usage. For example: "I go to school."

* Noun: This is less common, but can be used to refer to an attempt or effort, especially in sports. For example: "He made a go of it."

* Interjection: This is also uncommon, but can be used to express agreement or encouragement. For example: "Go for it!"

Without more context, it's difficult to say definitively which part of speech "go" is.