Formal:
* Profanity: This is the most neutral and formal term.
* Obscenity: This term is more specific and emphasizes the offensive nature of the word.
* Vulgarity: Similar to obscenity, but can also refer to crude or indecent language.
* Expletive: This word refers to a word or phrase used to express strong emotion, often anger or frustration.
* Swear word: This is a common and informal term.
Informal:
* Curse word: This is another common and informal term.
* Bad word: This is a more general term that doesn't necessarily imply the word is offensive.
* Four-letter word: This refers specifically to words with four letters, often considered to be the most offensive.
* F-bomb: This is a slang term specifically for the word "fuck".
The best word to use depends on the context and the level of formality you want.