Eder or Eider: How To spell?

The word Eder is misspelled against Eider, a noun meaning "Any species of sea duck of the genus Somateria, esp. Somateria mollissima, which breeds in the northern parts of Europe and America, and lines its nest with fine down (taken from its own body) which is an article of commerce; -- called also eider duck. The American eider (S. Dresseri), the king eider (S. spectabilis), and the spectacled eider (Arctonetta Fischeri) are related species."

Word begins with consecutive vowels 'EI' followed by alphabets 'der' is misspelled as 'E' as letter 'I' is phonetically ignored
Wrong Spelling:  e-der 
Correct Spelling:  ei-der 
Explore spell check of Eider to spell without errors.