Extemporanan or Extemporanean: How To spell?

The word Extemporanan is misspelled against Extemporanean, an adjective meaning "Extemporaneous."

Extemporanean has vowels 'ea' together mispronounced as 'a'
Word contains consecutive vowels 'EA' in between alphabets extemporan & n is misspelled as 'A'
Wrong Spelling:  extemporan-a-n 
Correct Spelling:  extemporan-ea-n 
Find more incorrect spellings of Extemporanean to spell right way.

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