arm vs wristband

arm and wristband both are nouns.

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

arm (noun)	wristband (noun)
the part of a garment that is attached at the armhole and that provides a cloth covering for the arm	band consisting of a part of a sleeve that covers the wrist
any instrument or instrumentality used in fighting or hunting	a band of cloth or leather or metal links attached to a wristwatch and wrapped around the wrist
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

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