The phrase "area between the lines" can be described using a variety of synonyms depending on the context and intended meaning. For example, the term "interstice" refers to the space between two objects or lines, while "interval" describes the distance or area between two points. "Gap" is another appropriate synonym, particularly when referring to a space where something is missing or incomplete. "Emptiness" conveys a sense of nothingness or void within the space between lines, while "negative space" is a term often used in art and design to describe the area around and between objects. Additionally, "interlinear space" can be used to specifically describe the area between lines of text.