Brainy Sort is a term used to describe someone who is intelligent and knowledgeable. The two crossword solutions for this term are NERD (4 letters) and EINSTEIN (8 letters). NERD is an acronym for 'Not Even Remotely Dorky' and is often used to describe someone who is highly intelligent but socially awkward. EINSTEIN is a reference to the famous physicist Albert EINSTEIN, who is widely regarded as one of the most intelligent people in history.