What are the opposite words for undersurface?

Undersurface refers to the bottom or lower side of an object or surface. Antonyms for this word include 'top surface' or 'upper surface' that indicate the uppermost part or the top layer of an object or surface. Other antonyms for undersurface include 'front', 'facing side', 'exterior', 'outer layer', and 'outer surface'. These antonyms are useful when describing the different sides of an object or identifying the specific layer of a surface. By using antonyms for undersurface, we can more accurately describe and understand the physical features and characteristics of objects and surfaces in our daily lives.