Is a hand a common noun or a proper noun or a collective noun or an abstract noun?

The noun hand is a common noun, a Word for any hand of anyone.

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

• Dr. Peter D. Hand, New Castle Orthopedic Surgeons, New Castle, PA
• Hand Street, Penn, PA and Hand Drive, Clarksville, TN
• American Society of Hand Therapists, Mount Laurel, NJ

A collective noun is a Word used to group people or things taken together as one whole, for example:

• a staff of employees
• a chain of islands
• a bouquet of flowers

An abstract noun is a Word that can't be experienced by any of the five physical senses; something that can't be seen, heard, smelled, tasted, or touched. An abstract noun is a Word for something that is known, understood, learned, thought, or felt emotionally. A hand can be seen and touched; a hand is a physical thing.