Heghtening or Heightening: How To spell?

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

Word contains consecutive vowels 'EI' in between alphabets h & ghtening is misspelled as 'E' as letter 'I' is phonetically igno
Wrong Spelling:  h-e-ghtening 
Correct Spelling:  h-ei-ghtening 
Find more wrongly spelled words of Heightening to spell it well.