pest

Short definition from Wiktionary

Noun

1. 1
   A pestilence, i.e. a deadly epidemic, a deadly plague.
2. 2
   Any destructive insect that attacks crops or livestock; an agricultural pest.
3. 3
   An annoying person, a nuisance.
4. 4
   An animal regarded as a nuisance, destructive, or a parasite, vermin.
5. 5
   An invasive weed.

Proper noun

1. 1
   One of the originally three separate cities that were united in 1873 to become the Hungarian capital, Budapest.
2. 2
   The corresponding part of the current-day city of Budapest, on the eastern side of the Danube.
3. 3
   A county in central Hungary, surrounding Budapest.