COMPETITOR - [noun] a person, a company, an instutution or a team that is competing against the others
Examples of use
We have more clients, because our prices are lower than those of our competitors.
Samsung is the biggest competitor for Nokia.
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English speaking practise
Remember that if you don't use that word in English conversations or writing you'll forget it in a short time. So the best thing you can do to learn this word is just trying to use it in speaking or writing. Remember also that practise is the key to fluent english speaking.
You can always find a partner, who would also like to improve his/her