这两个词,在很多情况下可以互换,但是也略有区分,这可以通过它们的英语解释看出来：
astonish：v.affect with wonder 使惊讶
A matter of repeated occurrence like this will not astonish people.
重复出现的事物不会使人吃惊.
amaze：v.
1.affect with wonder
Your ability to speak six languages amazes me!
2.be a mystery（神秘,秘密；奥秘） or bewildering （ 使人困惑的；令人产生混乱的）to
可见,除了【使吃惊】的意思之外,amaze还有【让人感到神秘或迷惑不解/混乱】之意,这是前者所没有的意思.