Pilai or Pilei: How To spell?

The word Pilai is misspelled against Pilei, which is plural of "Pileus"

Word ends with consecutive vowels 'EI' preceded by alphabets 'pil' is misspelled as 'AI'
Wrong Spelling:  pil-ai 
Correct Spelling:  pil-ei 
Find more wrongly spelled words of Pilei to spell it well.