Question

What is the difference between insect and pest?

Answer 1

Pest

A pest is a competitor of the human being. The term pest can be defined as, any creature or organism which causes harm to human being, beyond the economical threshold level. 

INSECT

Insects are a class of arthropods. They constantly interact with the human life, either as pests or as beneficial organisms.

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Answer 2

Insect is a small bug with several pairs of legs whereas pest is a destructive insect. Some insects may be beneficial to human beings whereas some pests may cause harm to human beings. Pesticides used to kill pests whereas insecticides used to kill insects.