chess game vs chess

chess game and chess both are nouns.

Word	Noun	Adjective	Verb	Adverb
chess game	Yes	No	No	No
chess	Yes	No	No	No

As nouns, chess game and chess are synonyms defined as:

chess game and chess: a board game for two players who move their 16 pieces according to specific rules; the object is to checkmate the opponent's king

chess game (noun)	chess (noun)
a board game for two players who move their 16 pieces according to specific rules; the object is to checkmate the opponent's king	a board game for two players who move their 16 pieces according to specific rules; the object is to checkmate the opponent's king
	weedy annual native to Europe but widely distributed as a weed especially in wheat