belt bag vs waist pack

belt bag and waist pack both are nouns.

Word	Noun	Adjective	Verb	Adverb
belt bag	Yes	No	No	No
waist pack	Yes	No	No	No

As nouns, belt bag and waist pack are synonyms defined as:

belt bag and waist pack: a small pouch (usually with a zipper) that attaches to a belt and is worn around the waist

belt bag (noun)	waist pack (noun)
a small pouch (usually with a zipper) that attaches to a belt and is worn around the waist	a small pouch (usually with a zipper) that attaches to a belt and is worn around the waist