hypnotizer vs hypnotiser

hypnotizer and hypnotiser both are nouns.

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

As nouns, hypnotizer and hypnotiser are synonyms defined as:

Other synonyms of hypnotizer include hypnotist, mesmerist, mesmerizer.

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