Nauthermore or Neithermore: How To spell?

The word Nauthermore is misspelled against Neithermore, an adjective meaning "Lower, nether."

Word contains consecutive vowels 'EI' in between alphabets n & thermore is misspelled as 'AU'
Wrong Spelling:  n-au-thermore 
Correct Spelling:  n-ei-thermore 
Check more misspelled words of Neithermore to spell it correct.