liquidity has 6 distinct synonyms spread across 2 of its 3 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 state in which a substance exhibits a characteristic readiness to flow with little or no tendency to disperse and relatively high incompressibility
the property of flowing easily
“adding lead makes the alloy easier to cast because the melting point is reduced and the fluidity is increased”
being in cash or easily convertible to cash; debt paying ability
Synonyms, antonyms and the broader and narrower relations for liquidity come from Princeton University’s WordNet. Full sources and licences.