erase v. 擦掉(e出+rase→擦出去)
eraser n. 橡皮;黑板擦(erase+er)
abrade v. 磨损(ab去掉+rade→磨擦掉)
abradant n. 砂纸(ab+rad+ant→用来打磨的东西→砂纸)
abrasive a. 有打磨作用的(ab+ras+ive)
raze v. 铲平,摧毁(raze=ras→擦掉→铲平)
razor n. 剃刀(raze+or)