card player vs dealer

card player and dealer both are nouns.

Word	Noun	Adjective	Verb	Adverb
card player	Yes	No	No	No
dealer	Yes	No	No	No

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

card player (noun)	dealer (noun)
someone who plays (or knows how to play) card games	a firm engaged in trading
	a seller of illicit goods
	the person who distributes the playing cards in a card game
	someone who purchases and maintains an inventory of goods to be sold
	the major party to a financial transaction at a stock exchange; buys and sells for his own account