Misunderstanding vs. blunder

[Yonler]

English Synonym, Elementary Level

ESL/EFL Test #72 "Synonyms for mistake and error", question 2

The new assistant made a ......... and as a result all the accounts were messed up.

(a) slip
(b) fault
(c) misunderstanding
(d) blunder

English Synonym, Elementary Level

ESL/EFL Test #72 "Synonyms for mistake and error", answer 2

The new assistant made a blunder and as a result all the accounts were messed up.

Correct answer: (d) blunder

Your answer was: incorrect
The new assistant made a misunderstanding and as a result all the accounts were messed up.
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why not misunderstanding?

Yonler

[Alan]

Hi Yonler,

A misunderstanding is not made, it takes place when two or more people do not undersatnd what has happened. A blunder suggests a serious and embarrassing mistake.

Alan
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English as a Second Language
You can read my ESL story Present Simple

[Laopdr]

I would like to know how different between blunder and slip, when do I use blunder or slip?