solvent has 8 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. Its one recorded opposite is insolvent.
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 liquid substance capable of dissolving other substances
“the solvent does not change its state in forming a solution”
a statement that solves a problem or explains how to solve the problem
“they were trying to find a peaceful solution”
capable of meeting financial obligations
Synonyms, antonyms and the broader and narrower relations for solvent come from Princeton University’s WordNet. Full sources and licences.