exchange（ex-出+change换→“换出”）有互换的意思
vt.交换, 调换, 兑换, 交流, 交易
n.交换, 调换, 兑换, 交流, 交易
He gave me an apple in exchange for a cake.
他给我一个苹果，换一块蛋糕。
Let's have an exchange of views on the matter.
我们对这件事交换一下意见吧。
exchange seats with sb.
与某人调换一个座位
change（没有互换的意思）
n.改变, 变化, 转变, 找回的零钱, 找头, 辅币
vt.改变, 变革, 改造, 兑换
You will see many changes in the village since last year.
你会看见自去年以来村里发生的变化。
change the mind
改变主意
In autumn the leaves change from green to brown.
秋天树叶由绿变黄。