However, we can understand what you might be asking based on the concept of concrete nouns.
Concrete nouns refer to things that can be perceived by our senses (sight, touch, smell, taste, hearing). These nouns represent tangible objects and entities.
Examples of concrete nouns:
* Table (can be seen and touched)
* Flower (can be seen and smelled)
* Music (can be heard)
* Water (can be seen, touched, tasted)
So, while there's no official "visible noun" category, concrete nouns are the closest equivalent, representing things that can be visually observed.