I would call him an agent
The word mission dates back to the late 1500's. The Jesuits were sent abroad on a mission which translates from Latin as 'act of sending' or 'to send'.
The word mission is:a noun; (mission, missions) a word for a group of people sent to perform a service or carry on an activity; the service or goal of that group of people; the buildings established as a base for that group of people.a verb; (mission, missions, missioning, missioned) to organize or establish a religious mission; to send on or entrust with a mission.an adjective; a word to describe a style of architecture or furniture fashioned after that of the Spanish missions of the southwestern United States.If you're looking for a word for a person who carries out a mission, that person is a missionary or missioner, both nouns as well.
He was a secret agent on a mission.
one who is sent off on a mission
Agent.
The word "missionary" is spelled as M-I-S-S-I-O-N-A-R-Y.
"We are on a mission from god" - Blues Bros "Our mission is to make our customers content" "What's my mission now?" "In Jamaica the church is called mission"
The rescue mission was futile.
The word emissary is a noun, and means someone who is sent on a special mission, typically involving diplomacy. The word emissary does not have an antonym.
Sent is typically used as a verb. "She sent me the package" is an example of how the word sent is used as a verb. Putting the word into a sentence helps a person determine what part of speech it is.
exile
god sent jesus to spread the word of the lord and he is the father almighty