two与twin war与warn normal与abnormal sob与absorb/absorption company与accompany add与additional evil与veil和devil wall与wallet
liquid与squid(n.鱿鱼,乌贼)
miser(吝啬鬼,守财奴)与wiser(聪明的,贤明的) roll与scroll(n.卷轴) lay与slay(屠杀,宰杀) rival与arrival
三、字母增减法
car scar scarf
row crow crowd crowded arrow narrow room broom groom bridegroom mushroom
den dense dent dentist dentistry density identity indentify identical but butt button butter utter pin spin spinach