armament vs armoury

armament and armoury both are nouns.

Word	Noun	Adjective	Verb	Adverb
armament	Yes	No	No	No
armoury	Yes	No	No	No

As nouns, armoury is a hyponym of armament; that is, armoury is a word with a more specific, narrower meaning than armament:

armament (noun)	armoury (noun)
the act of equipping with weapons in preparation for war	a place where arms are manufactured
weaponry used by military or naval force	a military structure where arms and ammunition and other military equipment are stored and training is given in the use of arms
	all the weapons and equipment that a country has
	a collection of resources