Instantaneaty or Instantaneity: How To spell?

The word Instantaneaty is misspelled against Instantaneity, a noun meaning "Quality of being instantaneous."

Word contains consecutive vowels 'EI' in between alphabets instantan & ty is misspelled as 'EA'
Wrong Spelling:  instantan-ea-ty 
Correct Spelling:  instantan-ei-ty 
Explore spell check of Instantaneity to spell without errors.