authorizer vs authoriser

authorizer and authoriser both are nouns.

Word	Noun	Adjective	Verb	Adverb
authorizer	Yes	No	No	No
authoriser	Yes	No	No	No

As nouns, authorizer and authoriser are synonyms defined as:

authorizer and authoriser: an authority who authorizes (people or actions)

authorizer (noun)	authoriser (noun)
an authority who authorizes (people or actions)	an authority who authorizes (people or actions)