Insect

noun

1. An arthropod in the class Insecta, characterized by six legs, up to four wings, and a chitinous exoskeleton.

   "Our shed has several insect infestions, including ants, yellowjackets, and wasps."

2. Any small arthropod similar to an insect including spiders, centipedes, millipedes, etc

   "The swamp is swarming with every sort of insect."

3. A contemptible or powerless person.

   "The manager’s assistant was the worst sort of insect."