passage has 7 distinct synonyms spread across 8 of its 10 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.
the act of passing from one state or place to the next
a section of text; particularly a section of medium length
a way through or along which someone or something may pass
a path or channel or duct through or along which something may pass
“the nasal passages”
the act of passing something to another person
Synonyms, antonyms and the broader and narrower relations for passage come from Princeton University’s WordNet. Full sources and licences.