Sum or Saim: How To spell?

The word Sum is misspelled against Saim, a noun meaning "Lard; grease."

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

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