* Slang: This is the most common term, referring to informal words and phrases specific to a particular group or time period.
* Colloquialism: This is a broader term for informal language that is used in everyday speech, often regional or specific to a particular group.
* Informal language: This is a general term that encompasses both slang and colloquialisms, as well as other words and phrases that are considered more casual and less formal.
* Idiom: This is a phrase that has a figurative meaning that is different from the literal meaning of the words. Idioms are often used in informal conversation.
* Vulgarism: This refers to words and phrases that are considered offensive or inappropriate in formal settings. While some vulgarisms can be used in informal conversation, they are not always appropriate.
The best word to use depends on the specific context and the level of formality you are aiming for.