When we looked at pronouns (▶see 2.6), we said that they are often used to replace a noun:
David loves football. He supports Manchester United.
Here, the personal pronoun he replaces the noun David. But consider:
The young boy who lives beside us loves football. He supports Manchester United.
In this case, he replaces the entire sequence the young boy who lives beside us. This is not a noun - it is a noun phrase (▶see 3.2). We call it a noun phrase because its central word - boy - is a noun. More correctly, then, a pronoun can be used to replace a noun phrase.
There are five phrase types:
the young boy
Main word: noun boy
has been stolen
Main word: verb stolen
Main word: adjective greedy