systemizer vs systemiser

systemizer and systemiser both are nouns.

Word	Noun	Adjective	Verb	Adverb
systemizer	Yes	No	No	No
systemiser	Yes	No	No	No

As nouns, systemizer and systemiser are synonyms defined as:

Other synonyms of systemizer include orderer, systematiser, systematist, systematizer.

systemizer (noun)	systemiser (noun)
an organizer who puts things in order	an organizer who puts things in order