Messenger would just make it Gods' messenger who takes the message and brings it to people.
Prophet is a Gods' one wise chosen one whom Gods' can use to show their powers to people.
I know this Question will utter but thanks for the advice Mirch bhai. I'll look up to other words to use instead of a prophet.
I knew you will say that . Messengers can be sent by anybody to anybody. Like kings used to send. Now a days also President and Prime Ministers and and all send messengers to deliver a special message personally. If message is important or needs to kept secret or some questions have to answered then messengers are used.