The word "non-concrete" refers to things that are abstract or theoretical in nature. The antonyms for this word are those that describe things that are physical, tangible, or experiential. Examples of antonyms for "non-concrete" include tangible, real, palpable, visible, substantial, and concrete. These words describe things that can be seen, touched, or experienced directly, and have a physical existence. Using antonyms for "non-concrete" can help to make your writing more precise and clear, by distinguishing between abstract concepts and more tangible ones.