german iris has 2 distinct synonyms spread across 2 of its 2 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.
iris of northern Italy having deep blue-purple flowers; similar to but smaller than Iris germanica
a large iris with purple or white flowers, native to central and southern Europe
Synonyms, antonyms and the broader and narrower relations for german iris come from Princeton University’s WordNet. Full sources and licences.