bidder

noun
1
a person or group that offers to pay an amount of money to buy something
پیشنهاددهنده, پیشنهادکننده, مزایده‌گر, مزایده‌دهنده
2
a person or group that offers to do something or to provide something for a particular amount of money, in competition with others
پیشنهاد‌دهنده, مزایده‌کننده, شرکت‌کننده در مزایده
There were six bidders for the catering contract.