systematist vs systemiser

systematist and systemiser both are nouns.

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

As nouns, systematist and systemiser are synonyms defined as:

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

systematist (noun)	systemiser (noun)
a biologist who specializes in the classification of organisms into groups on the basis of their structure and origin and behavior	an organizer who puts things in order
an organizer who puts things in order