bridge player vs bidder

bridge player and bidder both are nouns.

Word	Noun	Adjective	Verb	Adverb
bridge player	Yes	No	No	No
bidder	Yes	No	No	No

As nouns, bidder is a hyponym of bridge player; that is, bidder is a word with a more specific, narrower meaning than bridge player:

Other hyponyms of bridge player include bridge partner, contractor, declarer.

bridge player (noun)	bidder (noun)
a card player in a game of bridge	someone who makes an offer
	someone who makes a bid at cards