A group words built up round a single noun, which is called the Headword of the phrase. The noun phrases that follow all have the same headword, books:
Books.
Some books.
Some books about photography.
Some excellent books about photography.
Some really excellent books about photography.
In clauses noun phrases can be:
 Subject:
The hairy hand holding out the review to her was insistent.
 Object:
Harry lifted his bushy eyebrows at Elizabeth.
 Subject Complement:
It was a stirring tune.
 Object Complement:
But now the party faithful have appointed him crisis manager of a party still threatened by disintegration.
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