Syner or Seiner: How To spell?

The word Syner is misspelled against Seiner, a noun meaning "One who fishes with a seine."

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