Which word is spelt wrongly? Machinery, Missionery, Visionary, Mercenary

Machinery

Missionery

Visionary

Mercenary

All are correct

Missionery is the wrong spelling.
Missionary is the correct spelling.
Missionary means a person who has been sent to a place, usually a foreign country, to teach a religion to the people who live there.
Missionary means مبلغ دین