improvise vs improvize

improvise and improvize both are verbs.

Word	Noun	Adjective	Verb	Adverb
improvise	No	No	Yes	No
improvize	No	No	Yes	No

As verbs, improvise and improvize are synonyms defined as:

Other synonyms of improvise include ad-lib, extemporise, extemporize.

improvise (verb)	improvize (verb)
perform without preparation	perform without preparation
manage in a makeshift way; do with whatever is at hand