Pest and Porcupine

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

Porcupine and pest are semantically related. In some cases you can use "Porcupine" instead a noun "Pest".

Porcupine noun - Relatively large rodents with sharp erectile bristles mingled with the fur.

Pest and porcupine are semantically related. Sometimes you can use "Pest" instead a noun "Porcupine".