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It's the old thing with English homophones, the number one problem in English spelling and grammar education (or lack thereof). They sound the same but are derived from different roots. It's worth looking through a list of them at least once:
http://www.learnenglish.de/homophones/homophones.html
On the plus side, homophones make bad puns much easier to achieve.
Oliver Schick
I genuinely thought they were the same word (control and power as a common theme) and now you've gone and reined on my parade.