Dren or Drein: How To spell?

The word Dren is misspelled against Drein, a verb meaning "To drain."

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