Flea and Pest

Flea noun - Any wingless bloodsucking parasitic insect noted for ability to leap.

Pest and flea are semantically related. in bug topic. In some cases you can use "Pest" instead a noun "Flea", when it comes to topics like insect.

Pest noun - A widespread disease resulting in a high rate of death.

Flea and pest are semantically related. Sometimes you can use "Flea" instead a noun "Pest".