Checkren or Checkrein: How To spell?

The word Checkren is misspelled against Checkrein, a noun meaning "A branch rein connecting the driving rein of one horse of a span or pair with the bit of the other horse."

Word contains consecutive vowels 'EI' in between alphabets checkr & n is misspelled as 'E' as letter 'I' is phonetically ignore
Wrong Spelling:  checkr-e-n 
Correct Spelling:  checkr-ei-n 
Explore spell check of Checkrein to spell without errors.