Formal:
* Lingo: This word refers to a specialized vocabulary or jargon used by a particular group or profession.
* Vernacular: This term refers to the everyday language spoken by a particular group of people, often in a specific geographical area.
* Patois: This word specifically refers to a regional dialect, often considered less prestigious than the standard language.
* Slang: This refers to informal language used by a particular group, often changing rapidly.
* Idiom: This refers to a phrase or expression that has a figurative meaning different from its literal meaning, often specific to a particular language or dialect.
Informal:
* Jargon: Similar to "lingo", this refers to specialized vocabulary or jargon used by a particular group.
* Speak: This is a general term for a particular way of speaking.
* Accent: This refers to the distinctive way in which someone pronounces words, often associated with a particular region or social group.
* Tongue: This is a informal way of referring to a language or dialect.
The best synonym for "dialect" will depend on the specific context and the meaning you want to convey.