dollar volume vs volume

dollar volume and volume both are nouns.

Word	Noun	Adjective	Verb	Adverb
dollar volume	Yes	No	No	No
volume	Yes	No	No	No

As nouns, volume is a hypernym of dollar volume; that is, volume is a word with a broader meaning than dollar volume:

Other hypernyms of dollar volume include bulk, mass.

dollar volume (noun)	volume (noun)
the volume measured in dollars	physical objects consisting of a number of pages bound together
	the magnitude of sound (usually in a specified direction)
	the property of something that is great in magnitude
	a publication that is one of a set of several similar publications
	the amount of 3-dimensional space occupied by an object
	a relative amount