roulette vs game of chance

roulette and game of chance both are nouns.

Word	Noun	Adjective	Verb	Adverb
roulette	Yes	No	No	No
game of chance	Yes	No	No	No

As nouns, game of chance is a hypernym of roulette; that is, game of chance is a word with a broader meaning than roulette:

roulette: a gambling game in which players bet on which compartment of a revolving wheel a small ball will come to rest in
game of chance: a game that involves gambling

Other hypernyms of roulette include gambling game.

roulette (noun)	game of chance (noun)
a gambling game in which players bet on which compartment of a revolving wheel a small ball will come to rest in	a game that involves gambling
a wheel with teeth for making a row of perforations
a line generated by a point on one figure rolling around a second figure