la has 6 distinct synonyms spread across 3 of its 3 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.
a white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth
a state in southern United States on the Gulf of Mexico; one of the Confederate states during the American Civil War
Synonyms, antonyms and the broader and narrower relations for la come from Princeton University’s WordNet. Full sources and licences.
the syllable naming the sixth (submediant) note of a major or minor scale in solmization