Pseudosmallpox and Variola

Pseudosmallpox noun - A mild form of smallpox caused by a less virulent form of the virus.

Variola and pseudosmallpox are semantically related. In some cases you can use "Variola" instead a noun "Pseudosmallpox".

Variola noun - A highly contagious viral disease characterized by fever and weakness and skin eruption with pustules that form scabs that slough off leaving scars.

Pseudosmallpox and variola are semantically related. Sometimes you can replace term "Pseudosmallpox" with "Variola", this nouns are similar.