armoured car has 1 distinct synonym 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.
an armor-plated truck with strong doors and locks used to transport money or valuables
“the paintings were delivered to the museum in an air-conditioned armored car”
a military combat vehicle on wheels with light armor (and usually a machine gun)
Synonyms, antonyms and the broader and narrower relations for armoured car come from Princeton University’s WordNet. Full sources and licences.