There are several synonyms for the term "filthy words." Some common synonyms include profanity, obscenity, vulgarity, and cuss words. These types of language are often considered taboo and offensive in many cultures and can be seen as a violation of social norms. People use such language to vent their anger or frustration, to exhibit power or to simply offend others. However, the use of these words can also lead to negative consequences such as loss of respect, alienation, and even legal trouble. It is important to be mindful of the words we use and to use them in a way that is respectful to ourselves and others.