To convert (a word) into a noun or to use (a word) as a noun.
In the sentence ‘The poor should be helped,’ the adjective ‘poor’ has been nouned.
nounadjective
Relating to or functioning as a noun.
The chapter on noun clauses is particularly helpful.
nounnoun
A word that is the name of something (such as a person, animal, place, thing, quality, idea, or action) and is typically used in a sentence as the subject or object of a verb or as the object of a preposition.
In the sentence 'The cat sat on the mat,' both 'cat' and 'mat' are nouns.