进行一次和谈是have a peaceful talk还是have a peace talk?

问题描述:

进行一次和谈是have a peaceful talk还是have a peace talk?
答案上是have a peace talk,可是peace是名词啊怎么能修饰talk呢?请说明原因

have a peace talk
名词也可以修饰名词啊,再如:
our maths teacher
a stone building