A concrete noun (sometimes referred to as a tangible noun) is a noun which names anything (or anyone) that you can perceive through your physical senses: touch, sight, taste, hearing, or smell. A concrete noun is the opposite of a abstract noun.

The highlighted words in the following sentences are all concrete nouns:

The judge handed the files to the clerk.

Whenever they take the dog to the beach, it spends hours chasing waves.

The real estate agent urged the couple to buy the second house because it had new shingles.

As the car drove past the park, the thump of a disco tune overwhelmed the string quartet's rendition of a minuet.

The book binder replaced the flimsy paper cover with a sturdy, cloth-covered board.