lance has 6 distinct synonyms spread across 3 of its 6 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. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
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.
an implement with a shaft and barbed point used for catching fish
Synonyms, antonyms and the broader and narrower relations for lance come from Princeton University’s WordNet. Full sources and licences.
a surgical knife with a pointed double-edged blade; used for punctures and small incisions
move quickly, as if by cutting one's way
“Planes lanced towards the shore”
pierce with a lance, as in a knights' fight
open by piercing with a lancet
“lance a boil”