What part of speech is go?

"Go" can be several parts of speech depending on how it's used in a sentence:

* Verb: This is the most common usage. Example: "Please go to the store."

* Noun: It can be used as a noun, referring to a particular journey or attempt. Example: "We had a great go at climbing the mountain."

* Interjection: It can be used as an exclamation to express excitement or encouragement. Example: "Go! You can do it!"

So, without context, it's impossible to say for sure which part of speech "go" is.