The term DATA STRUCTURE WITH A ROOT NODE can be summarized as a type of data structure that has a root node. A root node is the topmost node in a tree-like structure, and it serves as the starting point for all other nodes. Trees are a type of data structure that is used to store and organize data in a hierarchical manner. They are composed of nodes, which can contain data or other nodes, and edges, which connect the nodes. Trees are often used to represent relationships between data, such as in a family tree. The four-letter solution to this crossword is TREE.