extemporaneous vs extempore

extemporaneous and extempore both are adjectives.

Word	Noun	Adjective	Verb	Adverb
extemporaneous	No	Yes	No	No
extempore	No	Yes	No	Yes

As adjectives, extemporaneous and extempore are synonyms defined as:

extemporaneous and extempore: with little or no preparation or forethought

Other synonyms of extemporaneous include ad-lib, extemporary, impromptu, off-the-cuff, offhand, offhanded, unrehearsed.

extemporaneous (adjective)	extempore (adjective)
with little or no preparation or forethought	with little or no preparation or forethought

extemporaneous (adverb)	extempore (adverb)
	without prior preparation