a noun.

a pronoun or other word or phrase functioning or inflected like a noun.

Grammar .

pertaining to substantives.

used in a sentence like a noun

a substantive adjective.

expressing existence

to be is a substantive verb.

having independent existence; independent.

belonging to the real nature or essential part of a thing; essential.

real or actual.

of considerable amount or quantity.

possessing substance; having practical importance, value, or effect

substantive issues under discussion.

Law . pertaining to the rules of right which courts are called on to apply, as distinguished from rules of procedure ( opposed to adjective ).

(of dye colors) attaching directly to the material without the aid of a mordant ( opposed to adjective ).

adjective

concrete , objective , substantial , tangible