Mons or Mains: How To spell?

The word Mons is misspelled against Mains, a noun meaning "The farm attached to a mansion house."

Word contains consecutive vowels 'AI' in between alphabets m & ns is misspelled as 'O'
Wrong Spelling:  m-o-ns 
Correct Spelling:  m-ai-ns 
Find more incorrect spellings of Mains to spell right way.

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