armor vs arm

armor and arm both are nouns.

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

armor (noun)	arm (noun)
tough more-or-less rigid protective covering of an animal or plant	the part of a garment that is attached at the armhole and that provides a cloth covering for the arm
protective covering made of metal and used in combat	any instrument or instrumentality used in fighting or hunting
a military unit consisting of armored fighting vehicles	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

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