The term 'Bookish One' can be described by four crossword solutions: NERD (4 letters), GEEK (4 letters), PEDANT (6 letters), and STUDENT (7 letters). A NERD is someone who is highly intelligent and socially awkward, often with an intense interest in a particular subject. A GEEK is similar to a NERD but is more likely to be interested in technology and popular culture. A PEDANT is someone who is overly concerned with details and rules, often to the point of being annoying. Finally, a STUDENT is someone who is actively engaged in learning, usually in an educational setting. All four of these terms can be used to describe someone who is bookish and studious.