Stun or Stain: How To spell?
The word Stun is misspelled against Stain, a noun meaning "A discoloration by foreign matter; a spot; as, a stain on a garment or cloth."
Word contains consecutive vowels 'AI' in between alphabets st & n is misspelled as 'U'Wrong Spelling:  st-u-n  Correct Spelling:  st-ai-n 
Check more misspelled words of Stain to spell it correct.