The term "line-sight" refers to the ability to see along a straight line or path. There are various synonyms that can be used to express this concept. For instance, "line of vision" is a common expression used in reference to line-sight. Others include "line of sight" and "visual range". When looking at visual communication or filmmaking, "camera angle" or "perspective" can be used as synonyms for line-sight. Additionally, "trajectory" is another synonym that can be used in reference to the course that is taken in a line-sight perspective. In summary, there are several synonyms that can be used to convey the meaning of line-sight depending on the context.