A field of KNOWLEDGE is a broad AREA of study that encompasses many different topics and sub-topics. The crossword solutions for this term are DOMAIN (6 letters), TERRITORY (9 letters), SPHERE (6 letters), AREA (4 letters), and KEN (3 letters). DOMAIN refers to a specific branch of KNOWLEDGE or a particular AREA of study, while TERRITORY is a larger AREA of study that encompasses multiple domains. SPHERE is a more general term that can refer to any AREA of KNOWLEDGE, while AREA is a more specific term that can refer to a particular topic within a DOMAIN. Finally, KEN is a Japanese word that means 'KNOWLEDGE' or 'UNDERSTANDING'.