The word "overlays" means to cover or place something over another thing. The antonyms for this word include "underlays," which means to place something underneath a surface, and "uncover," which means to remove something that is covering. Other antonyms for "overlays" include "reveal," "unmask," and "expose," all of which imply a removal of something that is covering or concealing. Overall, these antonyms suggest that "overlays" is a word that relates to covering up, concealing, or hiding something, while its antonyms all suggest that something is being revealed, exposed, or brought to light.