Archaost or Archaist: How To spell?

The word Archaost is misspelled against Archaist, a noun meaning "Am antiquary."

Word contains consecutive vowels 'AI' in between alphabets arch & st is misspelled as 'AO'
Wrong Spelling:  arch-ao-st 
Correct Spelling:  arch-ai-st 
Find more incorrect spellings of Archaist to spell right way.

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