worse has 1 distinct synonym spread across 1 of its 4 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 better.
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.
(comparative of `bad') inferior to another in quality or condition or desirability
“this road is worse than the first one we took”
something inferior in quality or condition or effect
“for better or for worse”
1 of the 4 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 worse.
Synonyms, antonyms and the broader and narrower relations for worse come from Princeton University’s WordNet. Full sources and licences.