There are many different synonyms for the phrase "bad words." Some common options include curse words, swear words, profanity, obscenities, and vulgar language. Other terms that might be used to describe language that is considered inappropriate or offensive could include blasphemy, expletives, scurrilous talk, or taboo language. In most cases, these words are considered inappropriate in polite company or formal settings, and can be used to express frustration or anger in casual or informal contexts. However, it's important to remember that using offensive language can be hurtful or offensive to others, so it's best to use these words with caution and respect.