Circumference refers to the boundary of an object, usually a circle, a sphere, or a curved shape. However, there are several synonyms for the word 'circumference' that can be used in different contexts. Some of the words that can be used instead of the circumferences are border, perimeter, rim, edge, outline, and boundary. Each of these words describes a different aspect of an object's outer boundary. Border is often used to describe a region's boundary, while perimeter refers to the length of a two-dimensional object's boundary. Rim describes the edge of a wheel or a similar object, while edge refers to the outer part of something. Outline and boundary describe a general boundary or the limit of a surface.