Aughth or Eighth: How To spell?

The word Aughth is misspelled against Eighth, a noun meaning "The interval of an octave."

Word begins with consecutive vowels 'EI' followed by alphabets 'ghth' is misspelled as 'AU'
Wrong Spelling:  au-ghth 
Correct Spelling:  ei-ghth 
Check more misspelled words of Eighth to spell it correct.