Pesticide

[Sommer]

Any substance used to kill, repel, or control a specific strain of plant or animal life considered by its user to be pests.
The act of killing someone for being annoying, or in some way bothering you.

[Michiko]

A substance used for destroying insects or other organisms harmful to cultivated plants or to animals.

[Vania]

a chemical substance used to kill harmful insects, small animals, wild plants, and other unwanted organisms: