different between smallpox vs variolation

English

From small +? pox.

smallpox (usually uncountable, plural smallpoxes)

(medicine) An acute, highly infectious often fatal disease caused by Variola virus of the family Poxviridae. It was completely eradicated in the 1970s. Those who survived were left with pockmarks.
Synonym: variola

variola +? -ation

variolation (countable and uncountable, plural variolations)

(historical) The inoculation of a person with smallpox so as to induce a mild form of the illness and subsequent immunity to it.

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