The best replacement for extermination is fumigation.

The best alternatives to extermination are rated as following:
★★★★★  fumigation
★  genocide

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

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



Google Trends

Scale is based on the average worldwide traffic of extermination in all years. Click on graph for more.
extermination
fumigation
genocide