The best replacement for chemical weapons is biological weapons.

The best alternatives to chemical weapons are rated as following:
★★★★★  biological weapons
★★★★  nuclear weapons
★★★  conventional weapons

Your alternative for chemical weapons is not listed? Suggest!
Speaking about chemical weapons, one probably shouldn't forget about syria.

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



Google Trends

Scale is based on the average worldwide traffic of chemical weapons in all years. Click on graph for more.
chemical weapons
biological weapons
nuclear weapons