pigment has 1 distinct synonym 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.
dry coloring material (especially a powder to be mixed with a liquid to produce paint, etc.)
Synonyms, antonyms and the broader and narrower relations for pigment come from Princeton University’s WordNet. Full sources and licences.
any substance whose presence in plant or animal tissues produces a characteristic color
a substance used as a coating to protect or decorate a surface (especially a mixture of pigment suspended in a liquid); dries to form a hard coating
“artists use `paint' and `pigment' interchangeably”