variola virus vs smallpox virus

variola virus and smallpox virus both are nouns.

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

As nouns, variola virus and smallpox virus are synonyms defined as:

variola virus and smallpox virus: the virus that causes smallpox in humans; can be used as a bioweapon

variola virus (noun)	smallpox virus (noun)
the virus that causes smallpox in humans; can be used as a bioweapon	the virus that causes smallpox in humans; can be used as a bioweapon