explosive has 1 distinct synonym spread across 1 of its 4 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 nonexplosive.
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.
serving to explode or characterized by explosion or sudden outburst
“an explosive device”
a chemical substance that undergoes a rapid chemical change (with the production of gas) on being heated or struck
1 of the 4 recorded senses carries no synonym, antonym or related term, so it is not shown above. Every sense, with its definition and examples, is on the full entry for explosive.
Synonyms, antonyms and the broader and narrower relations for explosive come from Princeton University’s WordNet. Full sources and licences.