Is Dysphemism the antonym of euphemism?

Yes, dysphemism is considered the antonym of euphemism. While a euphemism is a mild or indirect expression used to soften the impact of something that may be considered harsh or unpleasant, a dysphemism employs a harsh or derogatory term that intensifies the negative connotation. Essentially, euphemisms aim to make things sound better, whereas dysphemisms do the opposite.