systemiser vs systematist

systemiser and systematist both are nouns.

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

As nouns, systemiser and systematist are synonyms defined as:

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

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