What is the name of a cactus having cotton where it has thorns also it doesn't have so much of those things. those things are in a row?

The cactus you are describing sounds like the "Cotton Cactus," also known as "Mammillaria bocasana." This cactus features a woolly appearance due to the white, cotton-like fibers and has small, spiny protrusions arranged in a row. Though it has thorns, they are not overly prominent compared to its fluffy appearance.