Definition of adjective noun from the Oxford Advanced American Dictionary

 

adjective

 noun
noun
NAmE//ˈædʒɪktɪv//
 
(grammar)
 
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a word that describes a person or thing, for example big, red, and bright in a big house, red wine, and a bright idea “Reliable” is not an adjective that could be applied to my car.
NAmE//ˌædʒɪkˈtaɪvl//
 
adjective an adjectival phrase
adjectivally
 
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NAmE//‑ˈtaɪvəli//
 
adverb In “bread knife,” the word “bread” is used adjectivally.
See the Oxford Advanced Learner's Dictionary entry: adjective