Berber are bulky,knobby-looking loop pile with much larger loops than commercial grade loop pile carpet,usually made of olefin or olefin/nylon blend.Berber often has random specks of color,which are usually nylon blended in with the base olefin fibers.These rugs are popular residentially,esentially in family rooms,recreation rooms,and multimedia rooms.
Frieze carpets are tightly twisted yarn that gives a kinked or curled appearence to carpet pile. Pile lifting is too aggresive for this type of carpet.
Plush-A luxurious smooth-textured,highly textured,highly finished,sheared level cut pile carpet surface with a very smooth,formal look in which individual tufts are only minimally visible due to its low twist and the overall visual effect is that of a single level of yarn ends. Plush is longer and more dense than a saxony.
I think you got an better idea of these carpets now..