argument和controversy的区别？

Use a good English only dictionary such as:

http://dictionary.cambridge.org

Select "Learner's" dictionary for the easiest one.

argument
noun [C]
1 ANGRY DISCUSSION an angry discussion with someone in which you both disagree
They had an argument about who should do the cleaning.

2 REASON a reason or reasons why you support or oppose an idea, action, etc
There are many arguments for/against nuclear energy.

controversy
noun [C,U]
a lot of disagreement and argument about something
There is a lot of controversy over mobile phone towers.

for more info try
http://www.dictionary.com