An insect that causes damage to human needs and/or natural habitats and ecosystems.

An exterminator; a worker in pest control.

plural of pest controller

(slang, neologism) A person who sexually harasses others.

plural of sex pest

(uncountable) The practice of utilizing a broad range of pest-control techniques within an institution (as opposed to hiring out for pest-control services).

Any epidemic disease that is highly contagious, infectious, virulent and devastating. / (archaic) Anything harmful to morals or public order.

Anything, especially a synthetic substance but also any substance (e.g. sulfur), or virus, bacterium, or other organism, which kills or suppresses the activities of pests.

(transitive) To bother, harass, or annoy persistently. / (obsolete, transitive and intransitive) To crowd together thickly.

A bother or nuisance.