Sustein or Sustain: How To spell?
The word Sustein is misspelled against Sustain, a noun meaning "One who, or that which, upholds or sustains; a sustainer."
Word contains consecutive vowels 'AI' in between alphabets sust & n is misspelled as 'EI'Wrong Spelling:  sust-ei-n  Correct Spelling:  sust-ai-n 
Check more misspelled words of Sustain to spell it correct.