What are some non examples of concrete noun?

The alternative to concrete nouns is abstract nouns.

Examples of abstract nouns are: ability, beauty, curiOSity, drama, ego, fun, government, hope, idea, joy, knowledge, lesson, memory, need, opinion, question, romance, sorrow, trouble, urge, valor, wisdom, year, zeal.

Examples of concrete nouns are: acorn, baby, chair, diamond, egg, fudge, grass, house, ice, juice, kangaroo, lamp, mountain, nickel, oxygen, person, quilt, rust, star, turtle, umbrella, violet, wind, yeast, zebra.