Nabi Sallallahu Alaihi wa Sallam
Rasool Allah Sallallahu Alaihi wa Sallam
“Nabi (pl. Anbiya) is a Prophet, and a Rasul (pl. Rusul) is a Messenger.”
(A Nabi/Prophet is one who has received revelation from Allah but is not required or told to spread it, while a Rasul/Messenger, is someone who receives revelation and is told to spread it. Every Rasool is a Nabi, but not every Nabi is a Rasool.)
Muhammad Peace be upon him!