The antonyms for the word "most small scale" are as follows: largest, biggest, largest possible, and most extensive. These words all indicate something that is larger in size and scale than what is considered small. While "most small scale" is often used to describe something small, limited, or limited in scope, its antonyms convey a sense of immense scale, abundance, and magnitude. For example, the largest possible project could take months or even years to complete, while the most extensive network spans across continents. By using these antonyms, we can better convey a sense of size and scale in our conversations and writing.