where 引导的定语从句---准确的说应该是where引导的限制性关系从句
用来限制一些特定的名词
而where引导的状语从句在句中做状语
相当于at/in the place in which
而Where引导的限制性关系从句相当于at/on/to which可以相互替代
状语：
Let me take you where you live
the car is where you parked it
put it where we can see it
定语：
i have reached the point where i am about ready to retire
He came from Miami,where Jeanne had once spent a holiday.