jargons — a colorless to smoky gem variety of zircon.
idioms — an expression whose meaning is not predictable from the usual meanings of its constituent elements, as kick the bucket or hang one's head, or from the general grammatical rules of a language, as the table round for the round table, and that is not a constituent of a larger expression of like characteristics.
patois — a regional form of a language, especially of French, differing from the standard, literary form of the language.
