Nereas or Nereis: How To spell?

The word Nereas is misspelled against Nereis, a noun meaning "A genus, including numerous species, of marine chaetopod annelids, having a well-formed head, with two pairs of eyes, antennae, four pairs of tentacles, and a protrusile pharynx, armed with a pair of hooked jaws."

Word contains consecutive vowels 'EI' in between alphabets ner & s is misspelled as 'EA'
Wrong Spelling:  ner-ea-s 
Correct Spelling:  ner-ei-s 
Explore spell check of Nereis to spell without errors.