N of n
The 'giant' groupThe noun describes someone or something. The noun group after of indicates what kind of person or thing is being described. It usually begins with a.
This use is productive: a wide range of descriptive nouns can be used in this way.
gem giant humdinger jewel masterpiece peach pig slip (of a girl)
He was a giant of a man, with a deep voice that instantly commanded respect.
That yacht of his is a jewel of a boat.