latter has no recorded synonym. 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 former.
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.
referring to the second of two things or persons mentioned (or the last one or ones of several)
“in the latter case”
Synonyms, antonyms and the broader and narrower relations for latter come from Princeton University’s WordNet. Full sources and licences.