armour-clad vs steel-plated

armour-clad and steel-plated both are adjectives.

Word	Noun	Adjective	Verb	Adverb
armour-clad	No	Yes	No	No
steel-plated	No	Yes	No	No

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

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

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