smallpox vs variola

smallpox and variola both are nouns.

Word	Noun	Adjective	Verb	Adverb
smallpox	Yes	No	No	No
variola	Yes	No	No	No

As nouns, smallpox and variola are synonyms defined as:

smallpox and variola: a highly contagious viral disease characterized by fever and weakness and skin eruption with pustules that form scabs that slough off leaving scars

Other synonyms of smallpox include variola major.

smallpox (noun)	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	a highly contagious viral disease characterized by fever and weakness and skin eruption with pustules that form scabs that slough off leaving scars