armour-plated vs armor-plated

armour-plated and armor-plated both are adjectives.

Word	Noun	Adjective	Verb	Adverb
armour-plated	No	Yes	No	No
armor-plated	No	Yes	No	No

As adjectives, armour-plated and armor-plated are synonyms defined as:

Other synonyms of armour-plated include armor-clad, armour-clad, steel-plated.

armour-plated (adjective)	armor-plated (adjective)
covered with heavy steel	covered with heavy steel