Lethan or Lethean: How To spell?

The word Lethan is misspelled against Lethean, an adjective meaning "pertaining to Lethe; resembling in effect the water Lethe."

Lethean has vowels 'ea' together mispronounced as 'a'
Word contains consecutive vowels 'EA' in between alphabets leth & n is misspelled as 'A'
Wrong Spelling:  leth-a-n 
Correct Spelling:  leth-ea-n 
Explore spell check of Lethean to spell without errors.

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