Synonymity refers to the state or quality of being synonymous or having the same meaning as another word. Therefore, the antonyms for synonymity are words that convey the opposite meaning. Some of the antonyms for synonymity include dissimilarity, heterogeneity, incongruity, diversity, disparity, and contrast. Dissimilarity is a term that represents a complete lack of similarity between words, unlike in synonymity, where words are considered to be similar. Heterogeneity describes a situation where things or words are different and not uniform. The term incongruity refers to the state of not fitting together, while diversity represents variation or differences among things. Disparity denotes inconsistency or inequality, while contrast portrays the visible differences between two unlike things.