Who is "Prophet", "Nabi" and "Rasul"?

The word prophet means "the one conveys news, and the messenger". In the Holy Qur'an, the words of "nabi", "rasul" and "mursal" are used for the word prophet. 

The dictionary meaning of the word "nabi" is "the one giving news, the high-ranked person, the clear path". Its plural is anbiya. The message that nabi conveys is not an ordinary one, but a message that is undoubtedly accurate and very valuable. 

The words "rasul" and "mursal" mean "the sent person". The plurals of these two words are "rusul" and "mursalun." The prophets are called "nabi" for receiving important messages (revelation) from Allah, and "rasul" for conveying them to the people. As a terminology, "rasul" is used for the prophet, who is sent upon people with a new book and sharia. "Nabi" is used for the prophet who conveys the orders and prohibitions of Allah to people, yet who is not sent with a new book and sharia, instead notifies people about the book and sharia of a former prophet. (Kılavuz, Ahmet Saim vd., İlmihâl,  T.D.V.Y., Ankara, 2007, I/106) According to this, every nabi is a rasul at the same time. But not every nabi is a rasul. However, the words rasul and nabi are used interchangeably in the Holy Qur'an and hadiths, without any distinction between them. (In the Qur'an, the prophets Nuh (Noah), Ibrahim (Abraham), Ismael (Ishmael), Musa (Moses), Harun (Haroon), Isa (Jesus) and Muhammad are called both rasul and nabi.)*