descriptive linguistics vs prescriptive linguistics

descriptive linguistics and prescriptive linguistics both are nouns.

Word	Noun	Adjective	Verb	Adverb
descriptive linguistics	Yes	No	No	No
prescriptive linguistics	Yes	No	No	No

descriptive linguistics (noun)	prescriptive 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	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