Aighth or Eighth: How To spell?

The word Aighth 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 'AI'
Wrong Spelling:  ai-ghth 
Correct Spelling:  ei-ghth 
Find more wrongly spelled words of Eighth to spell it well.