The word Prosust is misspelled against Prosaist, a noun meaning "A writer of prose; an unpoetical writer."
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Word contains consecutive vowels 'AI' in between alphabets pros & st is misspelled as 'U'
Wrong Spelling:  pros-u-st 
Correct Spelling:  pros-ai-st 
Check more misspelled words of Prosaist to spell it correct.