A concrete noun is something that can be perceived by one of the five senses.
Fish, perfume, grapes, smoke, silk, velvet, finger, music, coffee, hamburger, cat, foot, soap, cotton, elbow, bells, lemonade, shower, mouse, stove, stairs, heart, lemon, and sand are all examples of concrete nouns. They can all be seen, smelt, tasted, heard or felt.
An abstract noun is something that cannot be perceived by any of the five senses.
Jealousy, anger, friendship, habit, manners, sympathy, promise, sadness, co-operation, love, partnership, routine, system, dare, life, and fear are all examples of abstract nouns.