Stuning or Staining: How To spell?

The word Stuning is misspelled against Staining, which is present continuous of "Stain"

Word contains consecutive vowels 'AI' in between alphabets st & ning is misspelled as 'U'
Wrong Spelling:  st-u-ning 
Correct Spelling:  st-ai-ning 
Check more misspelled words of Staining to spell it correct.

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