Variola major and White pox

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

White pox and variola major are semantically related. In some cases you can replace phrase "White pox" with "Variola major", this phrases are similar.

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

Variola major and white pox are semantically related. You can use "Variola major" instead a noun phrase "White pox".