Smallpox and White pox

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.

White pox and smallpox are semantically related. In some cases you can replace phrase "White pox" with "Smallpox", this terms are similar.

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

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