bolt has 20 distinct synonyms spread across 8 of its 16 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. Its one recorded opposite is unbolt.
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 discharge of lightning accompanied by thunder
a sliding bar in a breech-loading firearm that ejects an empty cartridge and replaces it and closes the breech
the part of a lock that is engaged or withdrawn with a key
a roll of cloth or wallpaper of a definite length
a screw that screws into a nut to form a fastener
a sudden abandonment (as from a political party)
move or jump suddenly
“She bolted from her seat”
Synonyms, antonyms and the broader and narrower relations for bolt come from Princeton University’s WordNet. Full sources and licences.
leave suddenly and as if in a hurry
“The listeners bolted when he discussed his strange ideas”
make or roll into bolts
“bolt fabric”