sir lancelot has 1 distinct synonym spread across 1 of its 1 sense. 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.
(Arthurian legend) one of the knights of the Round Table; friend of King Arthur until (according to some versions of the legend) he became the lover of Arthur's wife Guinevere
Synonyms, antonyms and the broader and narrower relations for sir lancelot come from Princeton University’s WordNet. Full sources and licences.