When we talk about dissimilarity, we refer to the lack of similarity, which implies that two or more things are different from each other. However, there are several antonyms or opposite words for dissimilarity, which include "similarity," "likeness," "sameness," or "resemblance." These words reflect that two or more things share characteristics, features, or qualities that make them comparable or connected. For instance, if two paintings have a similar style, color palette, or subject matter, we can say that they have a resemblance or likeness. Similarly, if two fruits are identical in shape, size, and texture, we can say that they have a sameness or similarity.