What is the difference between “crush”, “clash” and “crash”?

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May 16, 2011 11:34
All these words seem to mean “to hit something or someone heavily”, but I can’t understand what is the difference between “crush”, “clash” and “crash”.
In addition, we, as Japanese, are not good at distinguish R from L by sound. Of course, I am not exception. To me, these three words are similar not only on spellings but on pronunciation. They are very confusing to me.

I would appreciate it if you could correct this writing and answer my question.
Thank you for reading my English.