9 letters · 21 points in Scrabble
noun a chemical substance that undergoes a rapid chemical change (with the production of gas) on being heated or struck
adjective serving to explode or characterized by explosion or sudden outburst
adjective liable to lead to sudden change or violence
originFrom Latin explōs-, stem of the perfect passive participle of explōdō + the suffix -ive.
Etymology from Wiktionary, CC BY-SA 3.0