armour-clad vs armor-clad

armour-clad and armor-clad both are adjectives.

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

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

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

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