Armadura vs. blindaje
The Spanish words armadura and blindaje both refer to types of protective covering or armor. However, they are used in slightly different contexts and have somewhat distinct meanings.
Armadura
B1Armadura is a more general term for armor, often referring to historical or fantasy-style body armor worn by soldiers or knights. It can also imply the internal structure or skeleton that gives something its shape, like a building or a body.
El caballero llevaba una armadura de metal pesado.
(The knight was wearing heavy metal armor.)
La armadura de un edificio es lo que le proporciona su resistencia estructural.
(The armadura of a building is what provides it its structural strength.)
Blindaje
B2Blindaje is a specialized type of armor used for protecting vehicles, especially military ones, or rooms and buildings in modern times. It has the connotation of heavy, impenetrable protection designed to resist powerful weapons.
El tanque tiene un blindaje resistente a explosiones.
(The tank has explosion-resistant armor.)
La sala está equipada con blindaje contra radiación.
(The room is equipped with radiation shielding.)
Summary
Armadura and blindaje are both Spanish words for armor, but while armadura can refer to historical body armor or the internal framework of something, blindaje often denotes high-grade protection against modern weaponry for vehicles, rooms, or buildings.