sequence of one or more words that functions in a sentence as subject, object, or prepositional object
EXAMPLE The sequence of words "machine bolt" is a noun phrase.
word or group of words in a phrase around which the other constituents cluster
EXAMPLE 1 In the phrase "machine bolt", the word "bolt" is the head.
EXAMPLE 2 In the phrase "radial ball bearing with inner ring rotation", the word "bearing" is the head.
element of a noun phrase that serves to quantify or identify specific individuals
EXAMPLE Determiners include articles (e.g., "the" and "a"), quantifiers (e.g., "many", "most", "every"), demonstratives (e.g., "this", "that"), and possessive pronouns (e.g., "my", "your", "his", "her").
word or group of words that limits or describes another word or group of words
NOTE A modifier can be an adjective, an adverb, or a phrase or clause acting as an adjective or adverb.