NUISANCE - [noun] somebody or something thar causes annoyance
Examples of use
Everybody that suffered any type of migrane would tell you that it's a nuisance.
Growing up four nasty children without their father was a real nuisance for her.
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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