bunk has 26 distinct synonyms spread across 7 of its 9 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 bed on a ship or train; usually in tiers
a message that seems to convey no meaning
provide with a bunk
“We bunked the children upstairs”
flee; take to one's heels; cut and run
“If you see this man, run!”
Synonyms, antonyms and the broader and narrower relations for bunk come from Princeton University’s WordNet. Full sources and licences.