Is “Extemporising” a Scrabble word?
Yes
EXTEMPORISING
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Extemporising
verb
1.To do something, particularly to perform or speak, without prior planning or thought; to act in an impromptu manner; to improvise.
2.To do something in a makeshift way.
3.To make or create extempore.