The antonyms for the word "synonymities" would be words such as dissimilarity, disparity, difference, incongruity, and dissimilitude. These words relate to the idea of contrast or opposition rather than similarity or resemblance. While "synonymities" refers to the quality or state of being a synonym, its antonyms suggest diverse, contrasting, or discordant elements. For instance, dissimilarity implies differences in traits, qualities, or characteristics, while incongruity refers to inconsistency or lack of compatibility. By knowing the antonyms of "synonymities," we can gain a fuller understanding of the ways that language can convey both similarity and difference.