SUPPLIER - [noun] a company, person, organisaton that provides something that you need
Examples of use
AT&T is a leading supplier of mobile telephone services in the United States.
The building company signed an agreement with the new supplier of building materials.
Learn more English words
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