Comparing Symptoms

Both these diseases start out with flu-like symptoms (Fever, vomiting, headaches, muscle aches, etc…). Overtime, however, more distinguishable symptoms begin to develop. The most well known symptom of the Black Death is the formation of buboes. Buboes are lymph nodes that become infected and swollen. As the disease progresses, the infection will travel to other areas of the body. Eternal bleeding will occur at these affected areas, causing dark patches of skin.

As for Ebola, bleeding also occurs. Toward the end stages of the illness, an affected person will begin to bleed uncontrollably out of their eyes, ears, nose, and mouth. 

Sources

http://www.webmd.com/a-to-z-guides/ebola-fever-virus-infection

http://www.cnn.com/2014/04/11/health/ebola-fast-facts/

http://www.nlm.nih.gov/medlineplus/ency/article/001339.htm

http://www.medicinenet.com/plague_facts/article.htm

http://www.healthline.com/health/plague#Overview1