systematise vs systematize

systematise and systematize both are verbs.

Word	Noun	Adjective	Verb	Adverb
systematise	No	No	Yes	No
systematize	No	No	Yes	No

As verbs, systematise and systematize are synonyms defined as:

systematise and systematize: arrange according to a system or reduce to a system

Other synonyms of systematise include systemise, systemize.

systematise (verb)	systematize (verb)
arrange according to a system or reduce to a system	arrange according to a system or reduce to a system