Today’s word, angelos (Greek) or angelus (Latin) is quite similar to its English spelling; the first 5 letters is all you need to know – angel. An angel was a messenger from God. You can see the messenger component in some related words.
“An evangelist is a preacher, one who may travel from revival to revival evangelizing night after night. Televangelists stay close to home, spreading their message electronically from their own evangelical temples. The original evangelizers were Matthew, Mark, Luke, and John of the New Testament. The evangel is the gospel; an evangel is also an evangelist.”
– NTC’s Dictionary of Latin and Greek Origins, Bob and Maxine More, ISBN 0-8442-8321-5, pg.16
The origin of the word displays similarities between the Latin, Old English, Greek, and Middle French words.
“ Origin: bef. 950; 1890–95 for def. 9; ME a(u)ngel (< AF, OF) < LL angelus < NT Gk ángelos messenger of God, special use of Gk ángelos messenger; r. OE engel < L, as above”
“From Old English engel, influenced in Middle English by Old French angele, both from Late Latin angelus, from Ancient Greek ἄγγελος (angelos), “‘messenger’”)”