Profanity is the act of using rude words. The adjective is profane. Profanities can also be called swear words, curse ("cuss") words, dirty words, bad words, foul language, obscenity or obscene language, or expletives.
Religious profanity is called blasphemy. The verb is to blaspheme and the adjective is blasphemous. Saying “God!” or “Jesus Christ!” as an expression of surprise or annoyance is considered by many people to be blasphemy
A profanity usually refers to religion, sex, or bodily functions. These are things that people feel very strongly about.
A profanity can be a word or gesture or some other form of behaviour. Different words can be profanity to different people, and what words are thought of as profanity in English can change over time.