The word Cawstically is misspelled against Caustically, an adverb meaning "In a caustic manner."
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Word contains consecutive vowels 'AU' in between alphabets c & stically is misspelled as 'AW'
Wrong Spelling:  c-aw-stically 
Correct Spelling:  c-au-stically 
Find more wrongly spelled words of Caustically to spell it well.