volley ball vs volleyball game

volley ball and volleyball game both are nouns.

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

As nouns, volley ball and volleyball game are synonyms defined as:

volley ball and volleyball game: a game in which two teams hit an inflated ball over a high net using their hands

Other synonyms of volley ball include volleyball.

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