Insect repellents are substances used to repel or deter insects from entering an area. Two common insect repellents are shoos and camphors. Shoos is a five letter word that refers to a type of insect repellent made from plant oils, such as citronella oil. Camphors is an eight letter word that refers to a type of insect repellent made from the camphor tree, which is native to Asia. Both shoos and camphors are effective in keeping insects away from people and their homes.