sassafras tree has 2 distinct synonyms 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.
yellowwood tree with brittle wood and aromatic leaves and bark; source of sassafras oil; widely distributed in eastern North America
Synonyms, antonyms and the broader and narrower relations for sassafras tree come from Princeton University’s WordNet. Full sources and licences.