authoriser vs authorizer

authoriser and authorizer both are nouns.

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

As nouns, authoriser and authorizer are synonyms defined as:

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

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