Interregn or Interreign: How To spell?

The word Interregn is misspelled against Interreign, a noun meaning "An interregnum."

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