variolation vs variolization

variolation and variolization both are nouns.

Word	Noun	Adjective	Verb	Adverb
variolation	Yes	No	No	No
variolization	Yes	No	No	No

As nouns, variolation and variolization are synonyms defined as:

variolation and variolization: the obsolete process of inoculating a susceptible person with material taken from a vesicle of a person who has smallpox

variolation (noun)	variolization (noun)
the obsolete process of inoculating a susceptible person with material taken from a vesicle of a person who has smallpox	the obsolete process of inoculating a susceptible person with material taken from a vesicle of a person who has smallpox