A noun phrase forms a major part of a sentence.

This is our main goal.

He played a central role in the project.

It's difficult to solve a part of this problem.

The formation of a mountain requires millions of years.

He formed a new team.

A noun is one of the main elements of a sentence.

Please remember this phrase.

His poem is beautiful and has five stanzas.

His novel contains many beautiful passages of literature.