Is mushroom a proper noun

Answer 1

No, the noun mushroom is a common noun, a word for any mushroom of any kind.

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

• Connie Green, aka The Mushroom Lady, writer, forager
• Kennett Square PA,aka The Mushroom Capital of the World
• Mushroom Hill Road, Harrisburg, PA or Mushroom Boulevard, Rochester, NY
• Campbell's Cream of Mushroom with Roasted Garlic Soup
• "Murder By Mushroom", a novel by Virginia Smith

Answer 2

yes