armour vs suit of armor

armour and suit of armor both are nouns.

Word	Noun	Adjective	Verb	Adverb
armour	Yes	No	Yes	No
suit of armor	Yes	No	No	No

As nouns, suit of armor is a hyponym of armour; that is, suit of armor is a word with a more specific, narrower meaning than armour:

Other hyponyms of armour include body armor, body armour, cataphract, coat of mail, suit of armour, buckler, shield.

armour (noun)	suit of armor (noun)
tough more-or-less rigid protective covering of an animal or plant	armor that protects the wearer's whole body
protective covering made of metal and used in combat
a military unit consisting of armored fighting vehicles

armour (verb)	suit of armor (verb)
equip with armor