Haughtening or Heightening: How To spell?

The word Haughtening is misspelled against Heightening, which is present continuous of "Heighten"

Word contains consecutive vowels 'EI' in between alphabets h & ghtening is misspelled as 'AU'
Wrong Spelling:  h-au-ghtening 
Correct Spelling:  h-ei-ghtening 
Check more misspelled words of Heightening to spell it correct.