shield vs armour

shield and armour both are nouns.

Word	Noun	Adjective	Verb	Adverb
shield	Yes	No	Yes	No
armour	Yes	No	Yes	No

As nouns, armour is a hypernym of shield; that is, armour is a word with a broader meaning than shield:

Other hypernyms of shield include armor.

shield (noun)	armour (noun)
hard outer covering or case of certain organisms such as arthropods and turtles	tough more-or-less rigid protective covering of an animal or plant
armor carried on the arm to intercept blows	protective covering made of metal and used in combat
a protective covering or structure	a military unit consisting of armored fighting vehicles

shield (verb)	armour (verb)
protect, hide, or conceal from danger or harm	equip with armor
hold back a thought or feeling about