unbelt vs belt

unbelt is not a noun while belt is a noun.

Word	Noun	Adjective	Verb	Adverb
unbelt	No	No	Yes	No
belt	Yes	No	Yes	No

unbelt (noun)	belt (noun)
	the act of hitting vigorously
	a band to tie or buckle around the body (usually at the waist)
	endless loop of flexible material between two rotating shafts or pulleys
	ammunition (usually of small caliber) loaded in flexible linked strips for use in a machine gun
	a vigorous blow
	an elongated region where a specific condition or characteristic is found
	a path or strip (as cut by one course of mowing)