pest

noun5

1. •
   Any destructive insect that attacks crops or livestock; an agricultural pest.
2. •
   An animal regarded as a nuisance, destructive, or a parasite, vermin.
3. •
   An invasive weed.
4. •
   An annoying person, a nuisance.
5. •
   (no longer used) A pestilence, i.e. a deadly epidemic, a deadly plague.