Fusaon or Fusain: How To spell?

The word Fusaon is misspelled against Fusain, a noun meaning "A drawing made with it. See Charcoal, n. 2, and Charcoal drawing, under Charcoal."

Word contains consecutive vowels 'AI' in between alphabets fus & n is misspelled as 'AO'
Wrong Spelling:  fus-ao-n 
Correct Spelling:  fus-ai-n 
Check more misspelled words of Fusain to spell it correct.

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