Here's the breakdown:
* Glutton: This is the noun referring to a person who eats and drinks excessively. It's a concrete noun because it refers to a specific person.
* Gluttony: This is the abstract noun that refers to the *quality* or *act* of eating excessively. It's an abstract concept that can't be touched or seen.
Example:
* Concrete: "The glutton ate an entire cake."
* Abstract: "Gluttony is a vice that can lead to health problems."