Monks are members of Orders and are usuallly not Ordained except as needed by the Order. Hope this helps Br. Bishops, Priests anmd Deacons. The Pope is a Bishop, The Bishop of Rome the Successor of St. Peter. Cardinals are Bishops.
Priests are in charge of a parish or several parishes.
Sometimes other places like schools , Etc. Msg. is a Priest of distinguished service. Brothers ans Sisters are non-Ordained members of Orders. Monks are members of Orders and are usuallly not Ordained except as needed by the Order.