allspice has 3 distinct synonyms spread across 1 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.
aromatic West Indian tree that produces allspice berries
deciduous shrubs having aromatic bark; eastern China; southwestern and eastern United States
ground dried berrylike fruit of a West Indian allspice tree; suggesting combined flavors of cinnamon and nutmeg and cloves
Synonyms, antonyms and the broader and narrower relations for allspice come from Princeton University’s WordNet. Full sources and licences.