volume has 5 distinct synonyms spread across 3 of its 6 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
the property of something that is great in magnitude
“it is cheaper to buy it in bulk”
physical objects consisting of a number of pages bound together
“he used a large book as a doorstop”
a publication that is one of a set of several similar publications
“the third volume was missing”
a relative amount
“mix one volume of the solution with ten volumes of water”
the magnitude of sound (usually in a specified direction)
“the kids played their music at full volume”
Synonyms, antonyms and the broader and narrower relations for volume come from Princeton University’s WordNet. Full sources and licences.