What is the difference between an insect and a human?
There are quite a number of differences between human beings and insects. Insects are different to human beings when it comes to physical make up and metabolic functions. Insects are also different as they are not intelligent while human beings are.
That the one focuses upon insect pests and that the other includes insect and non-insect pests constitutes the difference between an insecticide and a pesticide. Specifically, the ending -cide advises users that the product is a deathly or disabling control. Not all pests are insects. For example, mites and ticks belong in the arachnid class with spiders, not the insect class with aphids and fleas.