systematiser vs systematizer

systematiser and systematizer both are nouns.

Word	Noun	Adjective	Verb	Adverb
systematiser	Yes	No	No	No
systematizer	Yes	No	No	No

As nouns, systematiser and systematizer are synonyms defined as:

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

systematiser (noun)	systematizer (noun)
an organizer who puts things in order	an organizer who puts things in order