Escudo:
A shield is a type of personal armor, meant to intercept attacks, either by stopping projectiles such as arrows or redirecting a blow from a sword, mace or battle axe to the side of the shield-bearer.
Shields vary greatly in size, ranging from large panels that protect the user's entire body to small models (such as the buckler) that were intended for hand-to-hand-combat use. Shields also vary a great deal in thickness; whereas some shields were made of relatively deep, absorbent, wooden planking to protect soldiers from the impact of spears and crossbow bolts, others were thinner and lighter and designed mainly for deflecting blade strikes.
Armadura:
Armour or armor (see spelling differences) is protective covering used to prevent damage from being inflicted to an object, individual or a vehicle through use of direct contact weapons or projectiles, usually during combat, or from damage caused by a potentially dangerous environment or action (e.g., cycling, sites of construction works) Personal armour is used to protect soldiers, war animals such as war horses (the application for the latter called barding). Vehicle armour is used on things such as warships and armoured fighting vehicles.