The term 'Vain Sort' can be broken down into two crossword solutions: FOP (3 letters) and DIVA (4 letters). FOP stands for 'Foolish, Ostentatious Person, ' which is someone who is overly concerned with their appearance and social status. A DIVA is a female singer or performer who is highly acclaimed and often demanding. Together, these two words describe someone who is vain and showy, and who puts on airs of superiority.