Sustonment or Sustainment: How To spell?

The word Sustonment is misspelled against Sustainment, a noun meaning "The act of sustaining; maintenance; support."

Word contains consecutive vowels 'AI' in between alphabets sust & nment is misspelled as 'O'
Wrong Spelling:  sust-o-nment 
Correct Spelling:  sust-ai-nment 
Check more misspelled words of Sustainment to spell it correct.

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