hypnotiser vs hypnotizer

hypnotiser and hypnotizer both are nouns.

Word	Noun	Adjective	Verb	Adverb
hypnotiser	Yes	No	No	No
hypnotizer	Yes	No	No	No

As nouns, hypnotiser and hypnotizer are synonyms defined as:

Other synonyms of hypnotiser include hypnotist, mesmerist, mesmerizer.

hypnotiser (noun)	hypnotizer (noun)
a person who induces hypnosis	a person who induces hypnosis