substantive

nouns

any word or group of words functioning as a noun
is derived from
is a type of (narrower)
a unit of language that native speakers can identify
"words are the blocks from which sentences are made"; "he hardly said ten words all morning"

adjectives

having a firm basis in reality and being therefore important, meaningful, or considerable
"substantial equivalents"
defining rights and duties as opposed to giving the rules by which rights and duties are established
"substantive law"
antonym
being on topic and prompting thought
"a meaty discussion"