angular vein has 1 distinct synonym 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.
a short vein formed by the supraorbital vein and the supratrochlear vein and continuing as the facial vein
Synonyms, antonyms and the broader and narrower relations for angular vein come from Princeton University’s WordNet. Full sources and licences.