Munstay or Mainstay: How To spell?

The word Munstay is misspelled against Mainstay, a noun meaning "Main support; principal dependence."

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

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