armament vs arm

armament and arm both are nouns.

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

armament (noun)	arm (noun)
the act of equipping with weapons in preparation for war	the part of a garment that is attached at the armhole and that provides a cloth covering for the arm
weaponry used by military or naval force	any instrument or instrumentality used in fighting or hunting
	the part of an armchair or sofa that supports the elbow and forearm of a seated person
	any projection that is thought to resemble a human arm
	a human limb; technically the part of the superior limb between the shoulder and the elbow but commonly used to refer to the whole superior limb
	a division of some larger or more complex organization

armament (verb)	arm (verb)
	prepare oneself for a military confrontation
	supply with arms