vermin

noun

1. (plural, singular)Any of various common types of small insects or other animals which cause harm and annoyance.

   “The area was crawling with all sorts of vermin: fleas, lice, mice, and rats to name a few. Thus, we felt as if vermin were crawling over us.”

   “Vermin was everywhere; night and day it crawled gaily over the walls and ceiling, about our bodies, and into our very food, and, although the subject did not interest us, a naturalist would have delighted in the ever-changing varieties of insect life.”

2. (plural, singular)An animal that preys on game, such as a fox or a weasel.
3. (plural, singular)An obnoxious or mean and offensive person.

   “Bring these vermin to the Palace of Justice.”