Insect repellents are products designed to ward off insects that can pose a nuisance, danger, or a health risk. Some common synonyms for insect repellents include bug spray, insecticides, mosquito repellent, bug repellent, and insect deterrents. Bug spray, as its name suggests, is a type of spray that repels bugs. Insecticides refer to chemicals designed to kill insects. Mosquito repellent is a specific term used for products designed to protect against mosquitoes. Bug repellent and insect deterrents are terms used to describe any type of product designed to keep insects from being in close proximity to humans, such as candles or plants.