It depends on what you want to see. They are homophones. Rough is the stick from the deck. It also means rude, rough, ordinary, rustic, rough, coarse, vulgar, of poor quality. Vast, it refers to a very large, very extensive. It denotes a quantity, a dimension, a vastness to immensity. Vast, infinite, immeasurable.
* Only one "like" per meaning and day, the more "likes" the meaning will appear higher in the list
