blunder, error, mistake这一组词都表示“错误”。

blunder n. (因为无知、疏忽犯下的)大错，愚蠢的错误。

I think that I committed a blunder in asking her because she seemed very upset by my question.
这位女士由于我的问题感到很难过，我感觉到犯了一个大错。

But he made an awful blunder.
但他犯了一个糟糕的大错误。

And in Brazil there is always the possibility of a scandal or blunder.
而且，巴西一直存在发生丑闻或捅出大漏子的可能性。

Sadly, we are still living with the consequences of that moral and strategic blunder.
可悲的是，我们仍然要容忍那些道德和战略大错的后果。

error n.指判断、计算或行为上的错误，也可指智力或道义上的错误。

The accident was the result of human error. 
这事故是人为的错误造成的。

How can she explain away her error?
她是怎样把错误解释过去的?

The accident was caused by human error.
这一事故是人为错误造成的。

The lawyer parted error from crime for him in court.
在法庭上律师把他的错误与罪行区分开来。

mistake n.误会，误解；(粗心、遗忘所导致的)错误。

I took your bag instead of mine by mistake.
我错拿了你的手提包。

She blasted to make him admit his mistake.
她激烈批评使他承认自己的错误。

He compounded his mistake by arguing with the teacher.
他与老师争吵就更加重了他的错误。

One should not plead inexperience in excuse of his mistake.
一个人不应该借口缺乏经验来为其错误辩解。