bus has 13 distinct synonyms spread across 4 of its 7 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.
a vehicle carrying many passengers; used for public transport
“he always rode the bus to work”
the topology of a network whose components are connected by a busbar
a car that is old and unreliable
“the fenders had fallen off that old bus”
send or move around by bus
“The children were bussed to school”
remove used dishes from the table in restaurants
Synonyms, antonyms and the broader and narrower relations for bus come from Princeton University’s WordNet. Full sources and licences.