armament vs arms

armament and arms both are nouns.

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

As nouns, arms is a hypernym of armament; that is, arms is a word with a broader meaning than armament:

Other hypernyms of armament include implements of war, munition, weaponry, weapons system.

armament (noun)	arms (noun)
the act of equipping with weapons in preparation for war	weapons considered collectively
weaponry used by military or naval force	the official symbols of a family, state, etc.