Pneumonic plague and Pest

Pneumonic plague noun - A rapidly progressive and frequently fatal form of the plague that can spread through the air from person to person; characterized by lung involvement with chill, bloody expectoration and high fever.

Pest and pneumonic plague are semantically related. In some cases you can use "Pest" instead a noun phrase "Pneumonic plague".

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

Pneumonic plague and pest are semantically related. Sometimes you can replace phrase "Pneumonic plague" with "Pest", this terms are similar.