tail has 34 distinct synonyms spread across 8 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 one recorded opposite is head.
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.
go after with the intent to catch
“The policeman chased the mugger down the alley”
Synonyms, antonyms and the broader and narrower relations for tail come from Princeton University’s WordNet. Full sources and licences.