organiser vs systemiser

organiser and systemiser both are nouns.

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

As nouns, systemiser is a hyponym of organiser; that is, systemiser is a word with a more specific, narrower meaning than organiser:

Other hyponyms of organiser include co-ordinator, coordinator, orderer, systematiser, systematist, systematizer, systemizer.

organiser (noun)	systemiser (noun)
a lightweight consumer electronic device that looks like a hand-held computer but instead performs specific tasks; can serve as a diary or a personal database or a telephone or an alarm clock etc.	an organizer who puts things in order
a person who brings order and organization to an enterprise
someone who enlists workers to join a union