Missionary (noun / adjective) — المُبشر: A person sent to spread a religion; a passionate promoter of a cause. Below are 8 words with a similar meaning; the linked ones have full GL Dictionary entries with their meaning in Arabic.
A messenger or representative, especially a diplomatic agent; someone sent on a special mission to represent others.
A messenger or advocate of a cause; one of the twelve disciples of Jesus; a pioneer or leading advocate
To publicly support or recommend; as a noun, a person who supports a cause or, in law, who pleads for another.
evangelistpreacherproselytisercampaignercrusader
Relating to or advocating the spread of Christian gospel through preaching and personal witness; characterized by zealous advocacy or fervent support for a…