Biddernoun
Someone who bids, e.g. at an auction
Biddernoun
One who bids or offers a price.
Biddernoun
someone who makes an offer
Biddernoun
someone who makes a bid at cards
Biddernoun
a person or organization making a formal offer for something, especially at an auction
Tenderernoun
One who tenders (a bid, a contract, etc.).