volume vs quantity

volume and quantity both are nouns.

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

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

volume: the amount of 3-dimensional space occupied by an object
quantity: how much there is or how many there are of something that you can quantify

Other hypernyms of volume include amount, measure.

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

volume: a relative amount
quantity: how much there is or how many there are of something that you can quantify

Other hypernyms of volume include amount, measure.

volume (noun)	quantity (noun)
physical objects consisting of a number of pages bound together	how much there is or how many there are of something that you can quantify
the magnitude of sound (usually in a specified direction)	an adequate or large amount
the property of something that is great in magnitude	the concept that something has a magnitude and can be represented in mathematical expressions by a constant or a variable
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