不等於
two hundred words就是200个词（或字）,只能做为名词使用,也就是做宾语,表语等等,比如说这篇短文有200个词语 there are two hundred words in this essay.
而two-hundred-word是200个词（或字）的,只能做定语（也就是形容词）成份,比如说写一篇200个词的短文 write a two-hundred-word essay