What hazard word indicates a risk of sudden explosion?

The term "explosive" specifically indicates a substance that poses a risk of sudden explosion. This hazard word is used to classify materials that can undergo a rapid chemical reaction, resulting in an explosion. This can occur due to pressure buildup, heat, or an ignition source, often with little to no warning. Explosives can be highly sensitive to shock or friction, making it crucial for those handling such materials to follow strict safety protocols.

In contrast, the other terms relate to different types of risks. "Corrosive" refers to substances that can damage or destroy living tissue or severe corrosion of materials upon contact. "Flammable" designates materials that can catch fire easily when exposed to an ignition source, typically requiring a certain concentration in the air to ignite. "Combustible" describes materials that can combust at higher temperatures than flammable materials, but they still require significant heat or an ignition source to catch fire. None of these terms encompass the unique risk of sudden and violent explosion that "explosive" accurately describes.