The word Abust is misspelled against Abaist, a preposition meaning "Abashed; confounded; discomfited."
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Word contains consecutive vowels 'AI' in between alphabets ab & st is misspelled as 'U'
Wrong Spelling:  ab-u-st 
Correct Spelling:  ab-ai-st 
Check more misspelled words of Abaist to spell it correct.