Formal terms:
* Jargon: This is the most common term, referring to the specialized vocabulary and expressions used by people in a particular profession or group.
* Technical language: This term emphasizes the specialized vocabulary and grammar used in a particular field, like science or engineering.
* Slang: While not always considered "specialized", slang can be used to refer to informal language used within a particular group or subculture.
* Argot: Similar to slang, this term refers to a specialized vocabulary used by a particular group to keep their communication private or exclusive.
* Cant: This term refers to the vocabulary used by criminals or other secret societies.
* Lingo: This term is a more informal way of referring to any type of specialized language.
Informal terms:
* Shop talk: This refers to conversations about work-related topics.
* Geek speak: This refers to the language used by people with a strong interest in a particular subject.
* Trade talk: Similar to "shop talk", this refers to conversations about a particular trade or profession.
The best word to use will depend on the specific context and the type of language you are referring to.