The Spanish word 'arcángel' (meaning 'archangel') comes from Latin 'archangelus', which was borrowed from Ancient Greek 'archangelos' (ἀρχάγγελος). The Greek word is a compound of two elements: 'archi-' (ἀρχι-) meaning 'chief' or 'first', and 'angelos' (ἄγγελος) meaning 'messenger'. So literally, an archangel is a 'chief messenger' or 'first messenger', referring to the highest ranking angels in the celestial hierarchy.

The Spanish word 'ángel' (meaning 'angel') is a simpler related word that comes from the same Greek root 'angelos'. Other Spanish words that share the 'archi-/arque-' prefix include 'arquitecto' (architect) and 'archivo' (archive), where this prefix maintains its meaning of 'chief' or 'primary'.

The English word 'archangel' is a direct cognate of Spanish 'arcángel', sharing the exact same Greek origins and meaning. The 'arch-' prefix appears in many English words like 'architect' (chief builder), 'archbishop' (chief bishop), and 'archenemy' (principal enemy). The 'angel' part is also found in words like 'angelical' and 'evangelist' (literally 'good messenger').