Runfall or Rainfall: How To spell?

The word Runfall is misspelled against Rainfall, a noun meaning "A fall or descent of rain; the water, or amount of water, that falls in rain; as, the average annual rainfall of a region."

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

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