Black plague and Bubonic plague

Black plague noun - The epidemic form of bubonic plague experienced during the Middle Ages when it killed nearly half the people of western Europe.

Bubonic plague and black plague are semantically related. In some cases you can use "Bubonic plague" instead a noun phrase "Black plague".

Bubonic plague noun - The most common form of the plague in humans; characterized by chills, prostration, delirium and the formation of buboes in the armpits and groin; does not spread from person to person.

Black plague and bubonic plague are semantically related. Sometimes you can replace phrase "Black plague" with "Bubonic plague", this phrases are similar.