* Verb: This is the most common usage. Example: "Please send me the file."
* Noun: It can be used as a noun to refer to the act of sending. Example: "The send was delayed due to a power outage."
* Adjective: Though less common, it can be used as an adjective, meaning "sent." Example: "I received a send email notification."
Let me know if you have a specific sentence in mind, and I can help you determine the part of speech.