Is a book a common noun or proper noun?

The noun 'book' is a common noun, a general Word for any book of any kind.

A proper noun is the name of a specific person, place, or thing.

Examples of proper nouns for the common noun 'book' are:

• Dr. Samuel Book, MD of New Haven, CT
• Book Street, Wallaceburg, ON Canada
• National Book Store
• Kelley Blue Book