The best replacement for gunpowder is black powder.

The best alternatives to gunpowder are rated as following:
★★★★★  black powder
★★★  dynamite
★★  flash powder
★  pinhead gunpowder
★  sencha
★  tnt
★  cordite

Your alternative for gunpowder is not listed? Suggest!
Speaking about gunpowder, one probably shouldn't forget about cocaine.

Other search terms related to gunpowder and their ratings are:
★★★★★ cocaine
★★★ rum
You have in mind a companion for gunpowder and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of gunpowder in all years. Click on graph for more.
gunpowder
black powder
dynamite