Hieghtened or Heightened: How To spell?

The word Hieghtened is misspelled against Heightened, which is past tense of "Heighten"

Word contains consecutive vowels 'EI' in between alphabets h & ghtened is misspelled as 'IE'
Wrong Spelling:  h-ie-ghtened 
Correct Spelling:  h-ei-ghtened 
Find more wrongly spelled words of Heightened to spell it well.