Alastrim and Smallpox

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

Smallpox and alastrim are semantically related. In some cases you can use "Smallpox" instead a noun "Alastrim".

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

Alastrim and smallpox are semantically related. Sometimes you can replace term "Alastrim" with "Smallpox", this nouns are similar.