liquid has 10 distinct synonyms spread across 6 of its 11 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. Its 2 recorded opposites are gaseous, solid.
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.
a substance that is liquid at room temperature and pressure
1 of the 11 recorded senses carries no synonym, antonym or related term, so it is not shown above. Every sense, with its definition and examples, is on the full entry for liquid.
Synonyms, antonyms and the broader and narrower relations for liquid come from Princeton University’s WordNet. Full sources and licences.
the state in which a substance exhibits a characteristic readiness to flow with little or no tendency to disperse and relatively high incompressibility
fluid matter having no fixed shape but a fixed volume
a frictionless continuant that is not a nasal consonant (especially `l' and `r')