The words 'mission' and 'missionary' are not widely used in the English Bible, where we usually find the words 'ministry' and 'minister'. But we often speak, for example, of the apostle Paul's missionary work and missionary journeys. Missionary is derived from the Latin equivalent of the Greek word 'apostle'.

They both mean 'one who is sent', and particularly in the Bible, 'one who is sent' to preach the gospel.
There is one example of the use of the word 'mission' in the NIV: "When Barnabas and Saul had finished their mission, they returned from Jerusalem, taking with them John, also called Mark." (Acts 12:25).

Mad, Madness
Magic
Man
Martyr
Mary
Mediator
Melchizedek
Memorial
Mercy
Messiah
Michael
Millennium
Minister
  1. The priests in the Old Testament
  2. The angels
  3. Jesus Christ and the apostles
  4. The civil authorities
Miracle
Mission, Missionary
Moderation
Mystery