Can an abstract noun be a common noun?

Yes, an abstract noun can be a common noun. A common noun is a Word for any person, place, or thing. Examples of common abstract nouns:

• ability
• beauty
• charity
• dream
• education
• fame
• guess
• hope
• ignorance
• jealousy
• kindness
• love
• memory
• need
• opinion
• pride
• question
• responsibility
• situation
• trust
• understanding
• value
• wealth
• year
• zeal

An abstract noun can also be a proper noun. A proper noun is the name of a person, place, thing, or a title. Examples of proper abstract nouns:

• Declaration of Independence
• The Hope Diamond
• Liberty, KY
• Mercy Street, Philadelphia, PA
• War and Peace by Leo Tolstoy

Additional answer.

Please note that the above definition includes 'person' in both common and 'proper' nouns. The name of a person is a proper noun.