foundry vs armoury

foundry and armoury both are nouns.

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

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

Other hyponyms of foundry include armory, arsenal, bell foundry, iron foundry.

foundry (noun)	armoury (noun)
factory where metal castings are produced	a place where arms are manufactured
	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