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a destructive insect or other animal that attacks crops, food, livestock, etc.:

害虫, 有害な小動物

e.g. the tomato plant attracts a pest called whitefly

e.g. an effective method for controlling insect pests

e.g. as modifier : pest control.

informal an annoying person or thing; a nuisance:

｟くだけて｠ 〖単数形で〗(主に子供をさして)やっかい者, 迷惑な人物, 問題児(nuisance)

e.g. he was a real pest.

(the pest) archaic bubonic plague.

｟古｠ ペスト, 悪疫

late 15th century (denoting the bubonic plague): from French peste or Latin pestis ‘plague’.