volley ball vs court game

volley ball and court game both are nouns.

Word	Noun	Adjective	Verb	Adverb
volley ball	Yes	No	No	No
court game	Yes	No	No	No

As nouns, court game is a hypernym of volley ball; that is, court game is a word with a broader meaning than volley ball:

volley ball: a game in which two teams hit an inflated ball over a high net using their hands
court game: an athletic game played on a court

volley ball (noun)	court game (noun)
a game in which two teams hit an inflated ball over a high net using their hands	an athletic game played on a court
an inflated ball used in playing volleyball