Aightieth or Eightieth: How To spell?

The word Aightieth is misspelled against Eightieth, a noun meaning "The quotient of a unit divided by eighty; one of eighty equal parts."

Word begins with consecutive vowels 'EI' followed by alphabets 'ghtieth' is misspelled as 'AI'
Wrong Spelling:  ai-ghtieth 
Correct Spelling:  ei-ghtieth 
Find more wrongly spelled words of Eightieth to spell it well.