Nouns

(n)modification, qualifying, limitingthe grammatical relation that exists when a word qualifies the meaning of the phrase

Adjectives

(s)confining, constraining, constrictive, limiting, restrictingrestricting the scope or freedom of action
(s)limitingstrictly limiting the reference of a modified word or phrase“the restrictive clause in ‘Each made a list of the books that had influenced him’ limits the books on the list to only those particular ones defined by the clause”