* Pit: This is a common and fairly neutral term used in many dialects.
* Armpit: This is the standard English word, but it can be considered more formal or clinical.
* Oxter: This is an older word that is still used in some dialects, particularly in England and the southern United States.
* Giblet: This term is used in some dialects of the United States, particularly in the South.
* Underarm: This is a more formal term that is often used in medical contexts.
* Armhole: This term is more common in British English.
It's important to note that some of these words can be considered slang or even offensive depending on the context.