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In some senses, explosive is marked as figuratively, dated. Watch for register when choosing this word.
VERBS
be
ADV
highly
The chemical plant kept highly explosive materials in a secure underground storage facility.
VERBS
be | become
ADV
highly
The topic of immigration became highly explosive during the political debate last week.
potentially
That old building is potentially explosive if anyone strikes a match near the gas leak.
ADJ
high
The police found high explosive materials hidden in the abandoned warehouse last week.
commercial, home-made | chemical, conventional, plastic, semtex
VERB + EXPLOSIVE
make, manufacture
plant
The security team discovered that someone had planted explosives beneath the bridge.
detonate, set off
EXPLOSIVE + NOUN
explosives expert