Syches or Seiches: How To spell?

The word Syches is misspelled against Seiches, a noun meaning "Local oscillations in level observed in the case of some lakes, as Lake Geneva."

Word contains consecutive vowels 'EI' in between alphabets s & ches is misspelled as 'Y'
Wrong Spelling:  s-y-ches 
Correct Spelling:  s-ei-ches 
Explore spell check of Seiches to spell without errors.