Thesaurus / adnouns
Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.

EXAMPLE SENTENCES FROM THE WEB

Adnouns are a class of words added to nouns to vary their comprehension, or to determine their extension.
But that theory which ranks them with adnouns, appears to rest on a sandy foundation.
Participles bear the same relation to verbs, that adnouns do to nouns.