What is the difference between a bug and an insect?
A bug is defined as belonging to the order Hemiptera. These creatures characteristically have tough forewings and lack teeth, such as beetles. However, insects belong to the class Insecta and they are characterized by three-part bodies, usually two pairs of wings, and three pairs of legs. For example, bees and mosquitoes are an insect. All of this does not mean that you are wrong to call various insect bugs. Because of the common usage of this meaning, it is certainly acceptable.