Descriptive linguistics and Prescriptive linguistics

Descriptive linguistics noun - A description (at a given point in time) of a language with respect to its phonology and morphology and syntax and semantics without value judgments.

Prescriptive linguistics is an antonym for descriptive linguistics.

Prescriptive linguistics noun - An account of how a language should be used instead of how it is actually used; a prescription for the `correct' phonology and morphology and syntax and semantics.

Descriptive linguistics is an antonym for prescriptive linguistics.