Is durian a proper noun

Answer 1

No, the word 'durian' is a common noun, a word for any durian fruit anywhere.

A proper noun is the name of a specific person, place, thing, or a title; for example:

• Dr. Rocheli Noble-Durian DDS, Walnut, CA
• Durian Street, Vista, CA or Durian Street, Mount Cotton, QLD Australia
• Mariza Durian Jam or Emerald Durian Jam
• "Waiting for the Durian: A Child's Life as a Prisoner of War", a novel by Susan J. McCabe