armed forces vs arsenal

armed forces and arsenal both are nouns.

Word	Noun	Adjective	Verb	Adverb
armed forces	Yes	No	No	No
arsenal	Yes	No	No	No

armed forces (noun)	arsenal (noun)
the military forces of a nation	a military structure where arms and ammunition and other military equipment are stored and training is given in the use of arms
	a place where arms are manufactured
	all the weapons and equipment that a country has