Prepod or Prepaid: How To spell?

The word Prepod is misspelled against Prepaid, which is past tense of "Prepay"

Word contains consecutive vowels 'AI' in between alphabets prep & d is misspelled as 'O'
Wrong Spelling: prep-o-d
Correct Spelling: prep-ai-d
Find more incorrect spellings of Prepaid to spell right way.