holster vs belt

holster and belt both are nouns.

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

As nouns, belt is a hypernym of holster; that is, belt is a word with a broader meaning than holster:

holster (noun)	belt (noun)
a sheath (usually leather) for carrying a handgun	the act of hitting vigorously
a belt with loops or slots for carrying small hand tools	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)