Cuban itch and Smallpox

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

Smallpox and Cuban itch are semantically related. In some cases you can use "Smallpox" instead a noun phrase "Cuban itch".

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.

Cuban itch and smallpox are semantically related. Sometimes you can replace phrase "Cuban itch" with "Smallpox", this terms are similar.