pest
Definitions
A destructive insect or other animal that attacks crops, food, or livestock.
A person or thing that causes nuisance, annoyance, or irritation.
Examples
The gardener used organic spray to keep every garden pest away from the vegetables.
My little brother can be such a pest when he keeps asking me the same question over and over.
The city council is working on a new strategy to control the rodent pest population in the downtown area.
Synonyms
nuisance annoyance bother irritant menace plague infestation