coral has 2 distinct synonyms spread across 1 of its 5 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.
the hard stony skeleton of a Mediterranean coral that has a delicate red or pink color and is used for jewelry
unfertilized lobster roe; reddens in cooking; used as garnish or to color sauces
marine colonial polyp characterized by a calcareous skeleton; masses in a variety of shapes often forming reefs
1 of the 5 recorded senses carries no synonym, antonym or related term, so it is not shown above. Every sense, with its definition and examples, is on the full entry for coral.
Synonyms, antonyms and the broader and narrower relations for coral come from Princeton University’s WordNet. Full sources and licences.