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A noun phrase – or NP or nominal (phrase) – is a phrase that usually has a noun or pronoun as its head, and has the same grammatical functions as a noun.[1] Noun phrases are very common cross-linguistically, and they may be the most frequently occurring phrase type.
Noun phrases often function as verb subjects and objects, as predicative expressions, and as complements of prepositions. One NP can be embedded inside another NP; for instance, some of his constituents has as a constituent the shorter NP his constituents.[2]
In some theories of grammar, noun phrases with determiners are analyzed as having the determiner as the head of the phrase, see for instance Chomsky (1995) and Hudson (1990) [citation needed].