Pesticides are chemicals used to kill or control pests, including insects, weeds, and fungi. There are several synonyms for pesticide, including insecticide, herbicide, fungicide, and rodenticide. Insecticides are used to kill or repel insects, while herbicides are used to kill or control weeds. Fungicides are used to control fungi and prevent plant diseases, and rodenticides are used to control rodents. Other synonyms for pesticide include biocide and antimicrobial, which are broader terms that encompass all types of microorganisms, including bacteria and viruses. While pesticides can be effective in controlling pests, their use can also have negative impacts on the environment and human health.