Here are some ways to express the noun concept of "tasty":
* Taste: This is the most general and direct noun for the concept of "tasty." It refers to the sensation of flavor.
* Flavor: This refers to the specific taste of something. You could say "This dish has a delicious flavor."
* Deliciousness: This is a more abstract noun that represents the quality of being tasty.
* Palatability: This is a more formal word that refers to the pleasantness of a food or drink.
* Savouriness: This refers to the quality of being savory or salty.
The best noun to use will depend on the specific context.