Eyther or Either: How To spell?

The word Eyther is misspelled against Either, an adjective meaning "Each of two; the one and the other; both; -- formerly, also, each of any number."

Word begins with consecutive vowels 'EI' followed by alphabets 'ther' is misspelled as 'EY'
Wrong Spelling:  ey-ther 
Correct Spelling:  ei-ther 
Explore spell check of Either to spell without errors.