Neathermore or Neithermore: How To spell?

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

Word contains consecutive vowels 'EI' in between alphabets n & thermore is misspelled as 'EA'
Wrong Spelling:  n-ea-thermore 
Correct Spelling:  n-ei-thermore 
Find more incorrect spellings of Neithermore to spell right way.