extemporistn.
/ɛkˈstɛmpərɪst/ rare.
One who is given to extemporize.
ΘΚΠ
the mind > language > speech > one who speaks > [noun] > improviser
extemporarian1680
extemporist1812
extemporizer1812
ad-libber1921
1812 Religionism 60 Extemporists.
This entry has not yet been fully updated (first published 1894; most recently modified version published online June 2021).
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n.1812