fluoridation vs fluoridization

fluoridation and fluoridization both are nouns.

Word	Noun	Adjective	Verb	Adverb
fluoridation	Yes	No	No	No
fluoridization	Yes	No	No	No

As nouns, fluoridation and fluoridization are synonyms defined as:

fluoridation and fluoridization: the addition of a fluoride to the water supply (to prevent dental decay)

Other synonyms of fluoridation include fluoridisation.

fluoridation (noun)	fluoridization (noun)
the addition of a fluoride to the water supply (to prevent dental decay)	the addition of a fluoride to the water supply (to prevent dental decay)