Cavstic or Caustic: How To spell?

The word Cavstic is misspelled against Caustic, meaning "biting sarcastic"

Word contains consecutive vowels 'AU' in between alphabets c & stic is misspelled as 'AV'
Wrong Spelling:  c-av-stic 
Correct Spelling:  c-au-stic 
Find more wrongly spelled words of Caustic to spell it well.

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