Menstay or Mainstay: How To spell?

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

Word contains consecutive vowels 'AI' in between alphabets m & nstay is misspelled as 'E'
Wrong Spelling:  m-e-nstay 
Correct Spelling:  m-ai-nstay 
Explore spell check of Mainstay to spell without errors.

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