Answer:
Aside from the fact that your question makes absolutely no sense whatsoever, I believe that the answer that you're looking for is that insects that prey upon other insects are insectivorous, generally speaking. Most insects are; however, omnivorous, eating both other insects and plants.
Building upon the previous answer to this question, one could interpret it as being "What insects are predators of other insects?" instead of "What is the term for insects that are predators of other insects?" In that case, some common examples would be dragonflies, hornets, ladybugs, robber flies, and praying mantises.