(grammar) a word that names a person, place, thing or idea; a noun (sensu stricto)

Part of a text that carries the meaning, such as words and their ordering.

(grammar) to make a word belonging to another part of speech into a substantive (that is, a noun) or use it as a noun

Of the essence or essential element of a thing; as, "substantive information"

Having substance; enduring; solid; firm; substantial

Applying to essential legal principles and rules of right; as, "substantive law"