insect

insect is a Noun

Definition:

[1] One of the Insecta; esp., one of the Hexapoda. See Insecta.

[2] Any air-breathing arthropod, as a spider or scorpion.

[3] Any small crustacean. In a wider sense, the word is often loosely applied to various small invertebrates.

[4] Fig.: Any small, trivial, or contemptible person or thing. Thomson. Insect powder,a powder used for the extermination of insects; esp., the powdered flowers of certain species of Pyrethrum, a genus now merged in Chrysanthemum. Called also Persian powder.